3x-21=12x

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Solution for 3x-21=12x equation:


Simplifying
3x + -21 = 12x

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

Solving
-21 + 3x = 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
-21 + 3x + -12x = 12x + -12x

Combine like terms: 3x + -12x = -9x
-21 + -9x = 12x + -12x

Combine like terms: 12x + -12x = 0
-21 + -9x = 0

Add '21' to each side of the equation.
-21 + 21 + -9x = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -9x = 0 + 21
-9x = 0 + 21

Combine like terms: 0 + 21 = 21
-9x = 21

Divide each side by '-9'.
x = -2.333333333

Simplifying
x = -2.333333333

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