90=12x+3x

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Solution for 90=12x+3x equation:


Simplifying
90 = 12x + 3x

Combine like terms: 12x + 3x = 15x
90 = 15x

Solving
90 = 15x

Solving for variable 'x'.

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

Add '-15x' to each side of the equation.
90 + -15x = 15x + -15x

Combine like terms: 15x + -15x = 0
90 + -15x = 0

Add '-90' to each side of the equation.
90 + -90 + -15x = 0 + -90

Combine like terms: 90 + -90 = 0
0 + -15x = 0 + -90
-15x = 0 + -90

Combine like terms: 0 + -90 = -90
-15x = -90

Divide each side by '-15'.
x = 6

Simplifying
x = 6

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