21-7n=

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Solution for 21-7n= equation:


21-7n=0

We simplify the equation to the form, which is simple to understand 
21-7n=0

We move all terms containing n to the left and all other terms to the right. 
-7n=0-21

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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