20=15-7n

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Solution for 20=15-7n equation: 



20=15-7n

We move all terms to the left:

20-(15-7n)=0

We add all the numbers together, and all the variables

-(-7n+15)+20=0

We get rid of parentheses

7n-15+20=0

We add all the numbers together, and all the variables

7n+5=0

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

7n=-5

n=-5/7

n=-5/7

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