8=n-21

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Solution for 8=n-21 equation:


Simplifying
8 = n + -21

Reorder the terms:
8 = -21 + n

Solving
8 = -21 + 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.
8 + -1n = -21 + n + -1n

Combine like terms: n + -1n = 0
8 + -1n = -21 + 0
8 + -1n = -21

Add '-8' to each side of the equation.
8 + -8 + -1n = -21 + -8

Combine like terms: 8 + -8 = 0
0 + -1n = -21 + -8
-1n = -21 + -8

Combine like terms: -21 + -8 = -29
-1n = -29

Divide each side by '-1'.
n = 29

Simplifying
n = 29

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