129=12b-15

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Solution for 129=12b-15 equation:


Simplifying
129 = 12b + -15

Reorder the terms:
129 = -15 + 12b

Solving
129 = -15 + 12b

Solving for variable 'b'.

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

Add '-12b' to each side of the equation.
129 + -12b = -15 + 12b + -12b

Combine like terms: 12b + -12b = 0
129 + -12b = -15 + 0
129 + -12b = -15

Add '-129' to each side of the equation.
129 + -129 + -12b = -15 + -129

Combine like terms: 129 + -129 = 0
0 + -12b = -15 + -129
-12b = -15 + -129

Combine like terms: -15 + -129 = -144
-12b = -144

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

Simplifying
b = 12

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