(x+13)+(x)=90

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Solution for (x+13)+(x)=90 equation:


Simplifying
(x + 13) + (x) = 90

Reorder the terms:
(13 + x) + (x) = 90

Remove parenthesis around (13 + x)
13 + x + (x) = 90
13 + x + x = 90

Combine like terms: x + x = 2x
13 + 2x = 90

Solving
13 + 2x = 90

Solving for variable 'x'.

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

Add '-13' to each side of the equation.
13 + -13 + 2x = 90 + -13

Combine like terms: 13 + -13 = 0
0 + 2x = 90 + -13
2x = 90 + -13

Combine like terms: 90 + -13 = 77
2x = 77

Divide each side by '2'.
x = 38.5

Simplifying
x = 38.5

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