3x-3(2x+18)=21

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Solution for 3x-3(2x+18)=21 equation:


Simplifying
3x + -3(2x + 18) = 21

Reorder the terms:
3x + -3(18 + 2x) = 21
3x + (18 * -3 + 2x * -3) = 21
3x + (-54 + -6x) = 21

Reorder the terms:
-54 + 3x + -6x = 21

Combine like terms: 3x + -6x = -3x
-54 + -3x = 21

Solving
-54 + -3x = 21

Solving for variable 'x'.

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

Add '54' to each side of the equation.
-54 + 54 + -3x = 21 + 54

Combine like terms: -54 + 54 = 0
0 + -3x = 21 + 54
-3x = 21 + 54

Combine like terms: 21 + 54 = 75
-3x = 75

Divide each side by '-3'.
x = -25

Simplifying
x = -25

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