18=n-21

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Solution for 18=n-21 equation:


Simplifying
18 = n + -21

Reorder the terms:
18 = -21 + n

Solving
18 = -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.
18 + -1n = -21 + n + -1n

Combine like terms: n + -1n = 0
18 + -1n = -21 + 0
18 + -1n = -21

Add '-18' to each side of the equation.
18 + -18 + -1n = -21 + -18

Combine like terms: 18 + -18 = 0
0 + -1n = -21 + -18
-1n = -21 + -18

Combine like terms: -21 + -18 = -39
-1n = -39

Divide each side by '-1'.
n = 39

Simplifying
n = 39

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