18-n=21

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Solution for 18-n=21 equation: 


Simplifying
18 + -1n = 21

Solving
18 + -1n = 21

Solving for variable 'n'.

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

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 = 3
-1n = 3

Divide each side by '-1'.
n = -3

Simplifying
n = -3

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