30-n=21

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Solution for 30-n=21 equation:


Simplifying
30 + -1n = 21

Solving
30 + -1n = 21

Solving for variable 'n'.

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

Add '-30' to each side of the equation.
30 + -30 + -1n = 21 + -30

Combine like terms: 30 + -30 = 0
0 + -1n = 21 + -30
-1n = 21 + -30

Combine like terms: 21 + -30 = -9
-1n = -9

Divide each side by '-1'.
n = 9

Simplifying
n = 9

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