-3x-3x=21-3

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


Simplifying
-3x + -3x = 21 + -3

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

Combine like terms: 21 + -3 = 18
-6x = 18

Solving
-6x = 18

Solving for variable 'x'.

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

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

Simplifying
x = -3

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