9n-2n=21

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Solution for 9n-2n=21 equation: 


Simplifying
9n + -2n = 21

Combine like terms: 9n + -2n = 7n
7n = 21

Solving
7n = 21

Solving for variable 'n'.

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

Divide each side by '7'.
n = 3

Simplifying
n = 3

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