21x=3x-12

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Solution for 21x=3x-12 equation: 


Simplifying
21x = 3x + -12

Reorder the terms:
21x = -12 + 3x

Solving
21x = -12 + 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.
21x + -3x = -12 + 3x + -3x

Combine like terms: 21x + -3x = 18x
18x = -12 + 3x + -3x

Combine like terms: 3x + -3x = 0
18x = -12 + 0
18x = -12

Divide each side by '18'.
x = -0.6666666667

Simplifying
x = -0.6666666667

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