12x=9x+21

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Solution for 12x=9x+21 equation: 


Simplifying
12x = 9x + 21

Reorder the terms:
12x = 21 + 9x

Solving
12x = 21 + 9x

Solving for variable 'x'.

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

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

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

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

Divide each side by '3'.
x = 7

Simplifying
x = 7

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