1-21=n

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Solution for 1-21=n equation:


Simplifying
1 + -21 = n

Combine like terms: 1 + -21 = -20
-20 = n

Solving
-20 = n

Solving for variable 'n'.

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

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

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

Add '20' to each side of the equation.
-20 + 20 + -1n = 0 + 20

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

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

Divide each side by '-1'.
n = -20

Simplifying
n = -20

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