-3x-4x=12

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Solution for -3x-4x=12 equation: 


Simplifying
-3x + -4x = 12

Combine like terms: -3x + -4x = -7x
-7x = 12

Solving
-7x = 12

Solving for variable 'x'.

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

Divide each side by '-7'.
x = -1.714285714

Simplifying
x = -1.714285714

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