-3x-3x=15-3

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Solution for -3x-3x=15-3 equation: 


Simplifying
-3x + -3x = 15 + -3

Combine like terms: -3x + -3x = -6x
-6x = 15 + -3

Combine like terms: 15 + -3 = 12
-6x = 12

Solving
-6x = 12

Solving for variable 'x'.

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

Divide each side by '-6'.
x = -2

Simplifying
x = -2

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