(20-n)=30

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Solution for (20-n)=30 equation: 


Simplifying
(20 + -1n) = 30

Remove parenthesis around (20 + -1n)
20 + -1n = 30

Solving
20 + -1n = 30

Solving for variable 'n'.

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

Add '-20' to each side of the equation.
20 + -20 + -1n = 30 + -20

Combine like terms: 20 + -20 = 0
0 + -1n = 30 + -20
-1n = 30 + -20

Combine like terms: 30 + -20 = 10
-1n = 10

Divide each side by '-1'.
n = -10

Simplifying
n = -10

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