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

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


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

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

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

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

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

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

Solving
38 + -1n = 25

Solving for variable 'n'.

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

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

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

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

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

Simplifying
n = 13

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