-b+3b=-12

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Solution for -b+3b=-12 equation: 


Simplifying
-1b + 3b = -12

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

Solving
2b = -12

Solving for variable 'b'.

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

Divide each side by '2'.
b = -6

Simplifying
b = -6

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