You have :
--------------
( x + 1 ) / ( x ) = ( -7 ) / ( x - 12 )
Multiply both sides by ( x ) ( x - 12 ) and get :
( x + 1 ) ( x - 12 ) = ( -7 ) ( x )
x^2 - 12x + x - 12 = -7x
x^2 - 4x - 12 = 0
Factor the above :
( x - 6 ) ( x + 2 ) = 0
There are two roots :
x = 6 <------------------
x = -2 <---------------
x= -6 + square root of 7, -6 - square root of 7
12 + 5 equals...
b = 14
a= -0.8
-0.5
If n + 7 = 12, then n = 12 - 7
1 over 3 plus 1 over 12 equals 5 over 12
-12=m+4 -16=m
-3
7x = 3x - 12 4x=-12 x=-3
A + 9 = 21 A = 21 - 9 A = 12
X = 12
X=6