12x+9=84-3x

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Solution for 12x+9=84-3x equation:


Simplifying
12x + 9 = 84 + -3x

Reorder the terms:
9 + 12x = 84 + -3x

Solving
9 + 12x = 84 + -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 = 84 + -3x + 3x

Combine like terms: 12x + 3x = 15x
9 + 15x = 84 + -3x + 3x

Combine like terms: -3x + 3x = 0
9 + 15x = 84 + 0
9 + 15x = 84

Add '-9' to each side of the equation.
9 + -9 + 15x = 84 + -9

Combine like terms: 9 + -9 = 0
0 + 15x = 84 + -9
15x = 84 + -9

Combine like terms: 84 + -9 = 75
15x = 75

Divide each side by '15'.
x = 5

Simplifying
x = 5

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