-20=15+7y

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Solution for -20=15+7y equation: 



-20=15+7y

We move all terms to the left:

-20-(15+7y)=0

We add all the numbers together, and all the variables

-(7y+15)-20=0

We get rid of parentheses

-7y-15-20=0

We add all the numbers together, and all the variables

-7y-35=0

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

-7y=35

y=35/-7

y=-5

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