21=n-15

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Solution for 21=n-15 equation:


Simplifying
21 = n + -15

Reorder the terms:
21 = -15 + n

Solving
21 = -15 + n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
21 + -1n = -15 + n + -1n

Combine like terms: n + -1n = 0
21 + -1n = -15 + 0
21 + -1n = -15

Add '-21' to each side of the equation.
21 + -21 + -1n = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -1n = -15 + -21
-1n = -15 + -21

Combine like terms: -15 + -21 = -36
-1n = -36

Divide each side by '-1'.
n = 36

Simplifying
n = 36

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