90=3x+12+x+6

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Solution for 90=3x+12+x+6 equation:


Simplifying
90 = 3x + 12 + x + 6

Reorder the terms:
90 = 12 + 6 + 3x + x

Combine like terms: 12 + 6 = 18
90 = 18 + 3x + x

Combine like terms: 3x + x = 4x
90 = 18 + 4x

Solving
90 = 18 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
90 + -4x = 18 + 4x + -4x

Combine like terms: 4x + -4x = 0
90 + -4x = 18 + 0
90 + -4x = 18

Add '-90' to each side of the equation.
90 + -90 + -4x = 18 + -90

Combine like terms: 90 + -90 = 0
0 + -4x = 18 + -90
-4x = 18 + -90

Combine like terms: 18 + -90 = -72
-4x = -72

Divide each side by '-4'.
x = 18

Simplifying
x = 18

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