90=(x+18)+(x+15)

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Solution for 90=(x+18)+(x+15) equation: 


Simplifying
90 = (x + 18) + (x + 15)

Reorder the terms:
90 = (18 + x) + (x + 15)

Remove parenthesis around (18 + x)
90 = 18 + x + (x + 15)

Reorder the terms:
90 = 18 + x + (15 + x)

Remove parenthesis around (15 + x)
90 = 18 + x + 15 + x

Reorder the terms:
90 = 18 + 15 + x + x

Combine like terms: 18 + 15 = 33
90 = 33 + x + x

Combine like terms: x + x = 2x
90 = 33 + 2x

Solving
90 = 33 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
90 + -2x = 33 + 2x + -2x

Combine like terms: 2x + -2x = 0
90 + -2x = 33 + 0
90 + -2x = 33

Add '-90' to each side of the equation.
90 + -90 + -2x = 33 + -90

Combine like terms: 90 + -90 = 0
0 + -2x = 33 + -90
-2x = 33 + -90

Combine like terms: 33 + -90 = -57
-2x = -57

Divide each side by '-2'.
x = 28.5

Simplifying
x = 28.5

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