-6=21-n

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Solution for -6=21-n equation:


Simplifying
-6 = 21 + -1n

Solving
-6 = 21 + -1n

Solving for variable 'n'.

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

Add 'n' to each side of the equation.
-6 + n = 21 + -1n + n

Combine like terms: -1n + n = 0
-6 + n = 21 + 0
-6 + n = 21

Add '6' to each side of the equation.
-6 + 6 + n = 21 + 6

Combine like terms: -6 + 6 = 0
0 + n = 21 + 6
n = 21 + 6

Combine like terms: 21 + 6 = 27
n = 27

Simplifying
n = 27

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