-7=4+y-1

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Solution for -7=4+y-1 equation: 



-7=4+y-1

We move all terms to the left:

-7-(4+y-1)=0

We add all the numbers together, and all the variables

-(y+3)-7=0

We get rid of parentheses

-y-3-7=0

We add all the numbers together, and all the variables

-1y-10=0

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

-y=10

y=10/-1

y=-10

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