n-21=21

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Solution for n-21=21 equation: 


Simplifying
n + -21 = 21

Reorder the terms:
-21 + n = 21

Solving
-21 + n = 21

Solving for variable 'n'.

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

Add '21' to each side of the equation.
-21 + 21 + n = 21 + 21

Combine like terms: -21 + 21 = 0
0 + n = 21 + 21
n = 21 + 21

Combine like terms: 21 + 21 = 42
n = 42

Simplifying
n = 42

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