(y-13)-(y+8)=7y

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Solution for (y-13)-(y+8)=7y equation: 



(y-13)-(y+8)=7y

We move all terms to the left:

(y-13)-(y+8)-(7y)=0

We add all the numbers together, and all the variables

-7y+(y-13)-(y+8)=0

We get rid of parentheses

-7y+y-y-13-8=0

We add all the numbers together, and all the variables

-7y-21=0

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

-7y=21

y=21/-7

y=-3

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