21=15-6n

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Solution for 21=15-6n equation:


Simplifying
21 = 15 + -6n

Solving
21 = 15 + -6n

Solving for variable 'n'.

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

Add '6n' to each side of the equation.
21 + 6n = 15 + -6n + 6n

Combine like terms: -6n + 6n = 0
21 + 6n = 15 + 0
21 + 6n = 15

Add '-21' to each side of the equation.
21 + -21 + 6n = 15 + -21

Combine like terms: 21 + -21 = 0
0 + 6n = 15 + -21
6n = 15 + -21

Combine like terms: 15 + -21 = -6
6n = -6

Divide each side by '6'.
n = -1

Simplifying
n = -1

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