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-28=9y-5y
We move all terms to the left:
-28-(9y-5y)=0
We add all the numbers together, and all the variables
-(+4y)-28=0
We get rid of parentheses
-4y-28=0
We move all terms containing y to the left, all other terms to the right
-4y=28
y=28/-4
y=-7
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