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-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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