x+x+18=90

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Solution for x+x+18=90 equation: 


Simplifying
x + x + 18 = 90

Reorder the terms:
18 + x + x = 90

Combine like terms: x + x = 2x
18 + 2x = 90

Solving
18 + 2x = 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 + 2x = 90 + -18

Combine like terms: 18 + -18 = 0
0 + 2x = 90 + -18
2x = 90 + -18

Combine like terms: 90 + -18 = 72
2x = 72

Divide each side by '2'.
x = 36

Simplifying
x = 36

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