-18+3n=21

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Solution for -18+3n=21 equation: 


Simplifying
-18 + 3n = 21

Solving
-18 + 3n = 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 + 3n = 21 + 18

Combine like terms: -18 + 18 = 0
0 + 3n = 21 + 18
3n = 21 + 18

Combine like terms: 21 + 18 = 39
3n = 39

Divide each side by '3'.
n = 13

Simplifying
n = 13

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