9x+18+3x=90

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Solution for 9x+18+3x=90 equation:


Simplifying
9x + 18 + 3x = 90

Reorder the terms:
18 + 9x + 3x = 90

Combine like terms: 9x + 3x = 12x
18 + 12x = 90

Solving
18 + 12x = 90

Solving for variable 'x'.

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

Add '-18' to each side of the equation.
18 + -18 + 12x = 90 + -18

Combine like terms: 18 + -18 = 0
0 + 12x = 90 + -18
12x = 90 + -18

Combine like terms: 90 + -18 = 72
12x = 72

Divide each side by '12'.
x = 6

Simplifying
x = 6

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