-2(3-b)=12

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Solution for -2(3-b)=12 equation: 


Simplifying
-2(3 + -1b) = 12
(3 * -2 + -1b * -2) = 12
(-6 + 2b) = 12

Solving
-6 + 2b = 12

Solving for variable 'b'.

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

Add '6' to each side of the equation.
-6 + 6 + 2b = 12 + 6

Combine like terms: -6 + 6 = 0
0 + 2b = 12 + 6
2b = 12 + 6

Combine like terms: 12 + 6 = 18
2b = 18

Divide each side by '2'.
b = 9

Simplifying
b = 9

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