(21)9-9n=9

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Solution for (21)9-9n=9 equation: 


Simplifying
(21) * 9 + -9n = 9

Multiply 21 * 9
189 + -9n = 9

Solving
189 + -9n = 9

Solving for variable 'n'.

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

Add '-189' to each side of the equation.
189 + -189 + -9n = 9 + -189

Combine like terms: 189 + -189 = 0
0 + -9n = 9 + -189
-9n = 9 + -189

Combine like terms: 9 + -189 = -180
-9n = -180

Divide each side by '-9'.
n = 20

Simplifying
n = 20

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