12-9+2b-b=-87

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


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

Combine like terms: 12 + -9 = 3
3 + 2b + -1b = -87

Combine like terms: 2b + -1b = 1b
3 + 1b = -87

Solving
3 + 1b = -87

Solving for variable 'b'.

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

Add '-3' to each side of the equation.
3 + -3 + 1b = -87 + -3

Combine like terms: 3 + -3 = 0
0 + 1b = -87 + -3
1b = -87 + -3

Combine like terms: -87 + -3 = -90
1b = -90

Divide each side by '1'.
b = -90

Simplifying
b = -90

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