7-12(13+b)=31

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Solution for 7-12(13+b)=31 equation:


Simplifying
7 + -12(13 + b) = 31
7 + (13 * -12 + b * -12) = 31
7 + (-156 + -12b) = 31

Combine like terms: 7 + -156 = -149
-149 + -12b = 31

Solving
-149 + -12b = 31

Solving for variable 'b'.

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

Add '149' to each side of the equation.
-149 + 149 + -12b = 31 + 149

Combine like terms: -149 + 149 = 0
0 + -12b = 31 + 149
-12b = 31 + 149

Combine like terms: 31 + 149 = 180
-12b = 180

Divide each side by '-12'.
b = -15

Simplifying
b = -15

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