3x-4x=15

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Solution for 3x-4x=15 equation: 


Simplifying
3x + -4x = 15

Combine like terms: 3x + -4x = -1x
-1x = 15

Solving
-1x = 15

Solving for variable 'x'.

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

Divide each side by '-1'.
x = -15

Simplifying
x = -15

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