# What is 12b minus 9 plus 2b minus b equal negative 87?

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12b - 9 + 2b - b = -87
13b - 9 = -87
13b = -87 +9
13b = -78
b = -6
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# 2 minus negative 9 equals?

2 - -9 = 2 + 9 = 11

-3

# Why does minus of minus equals plus?

The negative of a negative number is a positive number. The reason for this is that the first negative is a place holder for -1. When you have - - 4, that translates into -1

# A plus b equals 8 and a minus b equals 9?

Solve one of the formulas for A, then substitute that into the other formula to solve for B, then substitute the solution for B into one of the formulas to solve for A. Her

# What does 9 minus negative 3 minus 8 equals?

9 - -3 = 9 + 3 = 12 12 - 8 = 4 9 - -3 - 8 = 4

# Does a minus and a minus equal a plus?

Depends what you mean by " and ". If they're added : never If they're subtracted : sometimes If they're multiplied or divided : always

# Why minus minus equals plus?

You are taking something away a negative amount of times. Which means you are actually giving.

Negative 14

2a

# What is 9 minus negative 6 plus 20 equals?

9 - - 6 + 20 = 35

22

# How does minus minus equal plus?

When you are doing maths, you must see the equations as numbers. So 5-1 consists from the numbers +5 and -1. So 5-1=-1+5 however if you substract with a negative number you a

# How minus into minus is equal to plus?

yes its true because of multiplication property, for eg: (-2)(-3)=6. here -x-=+. likewise +x- or -x+ =(-). and if take another eg like (-1)^2(-1 ka whole square )= +1.

# Why does minus and minus equal plus?

Because a minus changes the sign. If you take a plus and change it to a minus, you get a minus. If you take a minus and change it to a minus, it changes back into a plus.

# What is 2b minus 4 equals 4 2b plus 1?

Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Pleas
In Algebra

# What does b equal in 2b minus b minus 10 equals negative 13?

Taking it step by step: 2b - b - 10 = -13 b - 10 = -13 b = -13 + 10 b = - 3