x-3x=7x+12

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Solution for x-3x=7x+12 equation: 


Simplifying
x + -3x = 7x + 12

Combine like terms: x + -3x = -2x
-2x = 7x + 12

Reorder the terms:
-2x = 12 + 7x

Solving
-2x = 12 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
-2x + -7x = 12 + 7x + -7x

Combine like terms: -2x + -7x = -9x
-9x = 12 + 7x + -7x

Combine like terms: 7x + -7x = 0
-9x = 12 + 0
-9x = 12

Divide each side by '-9'.
x = -1.333333333

Simplifying
x = -1.333333333

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