12x+9=21x-69

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Solution for 12x+9=21x-69 equation:


Simplifying
12x + 9 = 21x + -69

Reorder the terms:
9 + 12x = 21x + -69

Reorder the terms:
9 + 12x = -69 + 21x

Solving
9 + 12x = -69 + 21x

Solving for variable 'x'.

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

Add '-21x' to each side of the equation.
9 + 12x + -21x = -69 + 21x + -21x

Combine like terms: 12x + -21x = -9x
9 + -9x = -69 + 21x + -21x

Combine like terms: 21x + -21x = 0
9 + -9x = -69 + 0
9 + -9x = -69

Add '-9' to each side of the equation.
9 + -9 + -9x = -69 + -9

Combine like terms: 9 + -9 = 0
0 + -9x = -69 + -9
-9x = -69 + -9

Combine like terms: -69 + -9 = -78
-9x = -78

Divide each side by '-9'.
x = 8.666666667

Simplifying
x = 8.666666667

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