21n-90=225

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Solution for 21n-90=225 equation: 


Simplifying
21n + -90 = 225

Reorder the terms:
-90 + 21n = 225

Solving
-90 + 21n = 225

Solving for variable 'n'.

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

Add '90' to each side of the equation.
-90 + 90 + 21n = 225 + 90

Combine like terms: -90 + 90 = 0
0 + 21n = 225 + 90
21n = 225 + 90

Combine like terms: 225 + 90 = 315
21n = 315

Divide each side by '21'.
n = 15

Simplifying
n = 15

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