3x-120=7x

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Solution for 3x-120=7x equation:


Simplifying
3x + -120 = 7x

Reorder the terms:
-120 + 3x = 7x

Solving
-120 + 3x = 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.
-120 + 3x + -7x = 7x + -7x

Combine like terms: 3x + -7x = -4x
-120 + -4x = 7x + -7x

Combine like terms: 7x + -7x = 0
-120 + -4x = 0

Add '120' to each side of the equation.
-120 + 120 + -4x = 0 + 120

Combine like terms: -120 + 120 = 0
0 + -4x = 0 + 120
-4x = 0 + 120

Combine like terms: 0 + 120 = 120
-4x = 120

Divide each side by '-4'.
x = -30

Simplifying
x = -30

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