12b-b+2b-9=-87

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Solution for 12b-b+2b-9=-87 equation:


Simplifying
12b + -1b + 2b + -9 = -87

Reorder the terms:
-9 + 12b + -1b + 2b = -87

Combine like terms: 12b + -1b = 11b
-9 + 11b + 2b = -87

Combine like terms: 11b + 2b = 13b
-9 + 13b = -87

Solving
-9 + 13b = -87

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + 13b = -87 + 9

Combine like terms: -9 + 9 = 0
0 + 13b = -87 + 9
13b = -87 + 9

Combine like terms: -87 + 9 = -78
13b = -78

Divide each side by '13'.
b = -6

Simplifying
b = -6

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