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-7.5y+2.5y=17.5
We move all terms to the left:
-7.5y+2.5y-(17.5)=0
We add all the numbers together, and all the variables
-5y-17.5=0
We move all terms containing y to the left, all other terms to the right
-5y=17.5
y=17.5/-5
y=-3+2.5/5
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