15=3xn-21

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Solution for 15=3xn-21 equation:


Simplifying
15 = 3xn + -21

Reorder the terms:
15 = -21 + 3nx

Solving
15 = -21 + 3nx

Solving for variable 'n'.

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

Add '-3nx' to each side of the equation.
15 + -3nx = -21 + 3nx + -3nx

Combine like terms: 3nx + -3nx = 0
15 + -3nx = -21 + 0
15 + -3nx = -21

Add '-15' to each side of the equation.
15 + -15 + -3nx = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -3nx = -21 + -15
-3nx = -21 + -15

Combine like terms: -21 + -15 = -36
-3nx = -36

Divide each side by '-3x'.
n = 12x-1

Simplifying
n = 12x-1

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