3-(3x)=21

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


Simplifying
3 + -1(3x) = 21

Remove parenthesis around (3x)
3 + -1 * 3x = 21

Multiply -1 * 3
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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