12x-21=6x-9

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Solution for 12x-21=6x-9 equation:


Simplifying
12x + -21 = 6x + -9

Reorder the terms:
-21 + 12x = 6x + -9

Reorder the terms:
-21 + 12x = -9 + 6x

Solving
-21 + 12x = -9 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
-21 + 12x + -6x = -9 + 6x + -6x

Combine like terms: 12x + -6x = 6x
-21 + 6x = -9 + 6x + -6x

Combine like terms: 6x + -6x = 0
-21 + 6x = -9 + 0
-21 + 6x = -9

Add '21' to each side of the equation.
-21 + 21 + 6x = -9 + 21

Combine like terms: -21 + 21 = 0
0 + 6x = -9 + 21
6x = -9 + 21

Combine like terms: -9 + 21 = 12
6x = 12

Divide each side by '6'.
x = 2

Simplifying
x = 2

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