-21=-n-2n

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Solution for -21=-n-2n equation:


-21=-n-2n

We simplify the equation to the form, which is simple to understand 
-21=-n-2n

We move all terms containing n to the left and all other terms to the right. 
+1n+2n=+21

We simplify left and right side of the equation. 
+3n=+21

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

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