n-21=3n+9

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Solution for n-21=3n+9 equation:


n-21=3n+9

We simplify the equation to the form, which is simple to understand 
n-21=3n+9

We move all terms containing n to the left and all other terms to the right. 
+1n-3n=+9+21

We simplify left and right side of the equation. 
-2n=+30

We divide both sides of the equation by -2 to get n. 
n=-15

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