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-4.1=8.7+y/8

We move all terms to the left:

-4.1-(8.7+y/8)=0

We add all the numbers together, and all the variables

-(y/8+8.7)-4.1=0

We get rid of parentheses

-y/8-8.7-4.1=0

We multiply all the terms by the denominator

-y-(8.7)*8-(4.1)*8=0

We add all the numbers together, and all the variables

-1y-102.4=0

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

-y=102.4

y=102.4/-1

y=-102+0.40000000000001/1

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