-21=-6n-n

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Solution for -21=-6n-n equation:


-21=-6n-n

We simplify the equation to the form, which is simple to understand 
-21=-6n-n

We move all terms containing n to the left and all other terms to the right. 
+6n+1n=+21

We simplify left and right side of the equation. 
+7n=+21

We divide both sides of the equation by 7 to get n. 
n=3

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