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42=7+5y
We move all terms to the left:
42-(7+5y)=0
We add all the numbers together, and all the variables
-(5y+7)+42=0
We get rid of parentheses
-5y-7+42=0
We add all the numbers together, and all the variables
-5y+35=0
We move all terms containing y to the left, all other terms to the right
-5y=-35
y=-35/-5
y=+7
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