75=2n+21

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Solution for 75=2n+21 equation: 



75=2n+21

We move all terms to the left:

75-(2n+21)=0

We get rid of parentheses

-2n-21+75=0

We add all the numbers together, and all the variables

-2n+54=0

We move all terms containing n to the left, all other terms to the right

-2n=-54

n=-54/-2

n=+27

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