x+9+x=90

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Solution for x+9+x=90 equation: 


Simplifying
x + 9 + x = 90

Reorder the terms:
9 + x + x = 90

Combine like terms: x + x = 2x
9 + 2x = 90

Solving
9 + 2x = 90

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 2x = 90 + -9

Combine like terms: 9 + -9 = 0
0 + 2x = 90 + -9
2x = 90 + -9

Combine like terms: 90 + -9 = 81
2x = 81

Divide each side by '2'.
x = 40.5

Simplifying
x = 40.5

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