5x+18+7x-12=90

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Solution for 5x+18+7x-12=90 equation:


Simplifying
5x + 18 + 7x + -12 = 90

Reorder the terms:
18 + -12 + 5x + 7x = 90

Combine like terms: 18 + -12 = 6
6 + 5x + 7x = 90

Combine like terms: 5x + 7x = 12x
6 + 12x = 90

Solving
6 + 12x = 90

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 12x = 90 + -6

Combine like terms: 6 + -6 = 0
0 + 12x = 90 + -6
12x = 90 + -6

Combine like terms: 90 + -6 = 84
12x = 84

Divide each side by '12'.
x = 7

Simplifying
x = 7

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