x+(x+18)=40

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Solution for x+(x+18)=40 equation:


Simplifying
x + (x + 18) = 40

Reorder the terms:
x + (18 + x) = 40

Remove parenthesis around (18 + x)
x + 18 + x = 40

Reorder the terms:
18 + x + x = 40

Combine like terms: x + x = 2x
18 + 2x = 40

Solving
18 + 2x = 40

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 = 40 + -18

Combine like terms: 18 + -18 = 0
0 + 2x = 40 + -18
2x = 40 + -18

Combine like terms: 40 + -18 = 22
2x = 22

Divide each side by '2'.
x = 11

Simplifying
x = 11

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