72=3x+9x

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Solution for 72=3x+9x equation:


Simplifying
72 = 3x + 9x

Combine like terms: 3x + 9x = 12x
72 = 12x

Solving
72 = 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
72 + -12x = 12x + -12x

Combine like terms: 12x + -12x = 0
72 + -12x = 0

Add '-72' to each side of the equation.
72 + -72 + -12x = 0 + -72

Combine like terms: 72 + -72 = 0
0 + -12x = 0 + -72
-12x = 0 + -72

Combine like terms: 0 + -72 = -72
-12x = -72

Divide each side by '-12'.
x = 6

Simplifying
x = 6

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