12x-9=3x+21

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Solution for 12x-9=3x+21 equation:


Simplifying
12x + -9 = 3x + 21

Reorder the terms:
-9 + 12x = 3x + 21

Reorder the terms:
-9 + 12x = 21 + 3x

Solving
-9 + 12x = 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.
-9 + 12x + -3x = 21 + 3x + -3x

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

Combine like terms: 3x + -3x = 0
-9 + 9x = 21 + 0
-9 + 9x = 21

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

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

Combine like terms: 21 + 9 = 30
9x = 30

Divide each side by '9'.
x = 3.333333333

Simplifying
x = 3.333333333

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