-2(3+x)=12

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Solution for -2(3+x)=12 equation: 


Simplifying
-2(3 + x) = 12
(3 * -2 + x * -2) = 12
(-6 + -2x) = 12

Solving
-6 + -2x = 12

Solving for variable 'x'.

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

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

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

Combine like terms: 12 + 6 = 18
-2x = 18

Divide each side by '-2'.
x = -9

Simplifying
x = -9

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