x+(x+9)=18

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Solution for x+(x+9)=18 equation:


Simplifying
x + (x + 9) = 18

Reorder the terms:
x + (9 + x) = 18

Remove parenthesis around (9 + x)
x + 9 + x = 18

Reorder the terms:
9 + x + x = 18

Combine like terms: x + x = 2x
9 + 2x = 18

Solving
9 + 2x = 18

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 = 18 + -9

Combine like terms: 9 + -9 = 0
0 + 2x = 18 + -9
2x = 18 + -9

Combine like terms: 18 + -9 = 9
2x = 9

Divide each side by '2'.
x = 4.5

Simplifying
x = 4.5

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