21-3(1-x)=-3

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


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

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

Solving
18 + 3x = -3

Solving for variable 'x'.

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

Add '-18' to each side of the equation.
18 + -18 + 3x = -3 + -18

Combine like terms: 18 + -18 = 0
0 + 3x = -3 + -18
3x = -3 + -18

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

Divide each side by '3'.
x = -7

Simplifying
x = -7

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