21-1=n+7

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Solution for 21-1=n+7 equation:


Simplifying
21 + -1 = n + 7

Combine like terms: 21 + -1 = 20
20 = n + 7

Reorder the terms:
20 = 7 + n

Solving
20 = 7 + 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 = 7 + n + -1n

Combine like terms: n + -1n = 0
20 + -1n = 7 + 0
20 + -1n = 7

Add '-20' to each side of the equation.
20 + -20 + -1n = 7 + -20

Combine like terms: 20 + -20 = 0
0 + -1n = 7 + -20
-1n = 7 + -20

Combine like terms: 7 + -20 = -13
-1n = -13

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

Simplifying
n = 13

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