-3(-4+x)=21

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Solution for -3(-4+x)=21 equation: 


Simplifying
-3(-4 + x) = 21
(-4 * -3 + x * -3) = 21
(12 + -3x) = 21

Solving
12 + -3x = 21

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + -3x = 21 + -12

Combine like terms: 12 + -12 = 0
0 + -3x = 21 + -12
-3x = 21 + -12

Combine like terms: 21 + -12 = 9
-3x = 9

Divide each side by '-3'.
x = -3

Simplifying
x = -3

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