-3(x-3)=21

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


Simplifying
-3(x + -3) = 21

Reorder the terms:
-3(-3 + x) = 21
(-3 * -3 + x * -3) = 21
(9 + -3x) = 21

Solving
9 + -3x = 21

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + -3x = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -3x = 21 + -9
-3x = 21 + -9

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

Divide each side by '-3'.
x = -4

Simplifying
x = -4

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