(20-x)+x+(18-x)=25

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Solution for (20-x)+x+(18-x)=25 equation:


Simplifying
(20 + -1x) + x + (18 + -1x) = 25

Remove parenthesis around (20 + -1x)
20 + -1x + x + (18 + -1x) = 25

Remove parenthesis around (18 + -1x)
20 + -1x + x + 18 + -1x = 25

Reorder the terms:
20 + 18 + -1x + x + -1x = 25

Combine like terms: 20 + 18 = 38
38 + -1x + x + -1x = 25

Combine like terms: -1x + x = 0
38 + 0 + -1x = 25
38 + -1x = 25

Solving
38 + -1x = 25

Solving for variable 'x'.

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

Add '-38' to each side of the equation.
38 + -38 + -1x = 25 + -38

Combine like terms: 38 + -38 = 0
0 + -1x = 25 + -38
-1x = 25 + -38

Combine like terms: 25 + -38 = -13
-1x = -13

Divide each side by '-1'.
x = 13

Simplifying
x = 13

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