120=15-21n

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Solution for 120=15-21n equation:


Simplifying
120 = 15 + -21n

Solving
120 = 15 + -21n

Solving for variable 'n'.

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

Add '21n' to each side of the equation.
120 + 21n = 15 + -21n + 21n

Combine like terms: -21n + 21n = 0
120 + 21n = 15 + 0
120 + 21n = 15

Add '-120' to each side of the equation.
120 + -120 + 21n = 15 + -120

Combine like terms: 120 + -120 = 0
0 + 21n = 15 + -120
21n = 15 + -120

Combine like terms: 15 + -120 = -105
21n = -105

Divide each side by '21'.
n = -5

Simplifying
n = -5

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