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7.5=y-3
We move all terms to the left:
7.5-(y-3)=0
We get rid of parentheses
-y+3+7.5=0
We add all the numbers together, and all the variables
-1y+10.5=0
We move all terms containing y to the left, all other terms to the right
-y=-10.5
y=-10.5/-1
y=10+0.5/1
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