-18=1x-3x

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Solution for -18=1x-3x equation:


Simplifying
-18 = 1x + -3x

Combine like terms: 1x + -3x = -2x
-18 = -2x

Solving
-18 = -2x

Solving for variable 'x'.

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

Add '2x' to each side of the equation.
-18 + 2x = -2x + 2x

Combine like terms: -2x + 2x = 0
-18 + 2x = 0

Add '18' to each side of the equation.
-18 + 18 + 2x = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 2x = 0 + 18
2x = 0 + 18

Combine like terms: 0 + 18 = 18
2x = 18

Divide each side by '2'.
x = 9

Simplifying
x = 9

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