x=3x-21

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Solution for x=3x-21 equation: 


Simplifying
x = 3x + -21

Reorder the terms:
x = -21 + 3x

Solving
x = -21 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
x + -3x = -21 + 3x + -3x

Combine like terms: x + -3x = -2x
-2x = -21 + 3x + -3x

Combine like terms: 3x + -3x = 0
-2x = -21 + 0
-2x = -21

Divide each side by '-2'.
x = 10.5

Simplifying
x = 10.5

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