-3(1-1x)=-21

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


Simplifying
-3(1 + -1x) = -21
(1 * -3 + -1x * -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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