-3(-4+B)=12

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Solution for -3(-4+B)=12 equation: 


Simplifying
-3(-4 + B) = 12
(-4 * -3 + B * -3) = 12
(12 + -3B) = 12

Add '-12' to each side of the equation.
12 + -12 + -3B = 12 + -12

Combine like terms: 12 + -12 = 0
0 + -3B = 12 + -12
-3B = 12 + -12

Combine like terms: 12 + -12 = 0
-3B = 0

Solving
-3B = 0

Solving for variable 'B'.

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

Divide each side by '-3'.
B = 0

Simplifying
B = 0

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