-3(x-1)=21

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Solution for -3(x-1)=21 equation: 


Simplifying
-3(x + -1) = 21

Reorder the terms:
-3(-1 + x) = 21
(-1 * -3 + x * -3) = 21
(3 + -3x) = 21

Solving
3 + -3x = 21

Solving for variable 'x'.

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

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

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

Combine like terms: 21 + -3 = 18
-3x = 18

Divide each side by '-3'.
x = -6

Simplifying
x = -6

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