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3.5-5y=13
We move all terms to the left:
3.5-5y-(13)=0
We add all the numbers together, and all the variables
-5y-9.5=0
We move all terms containing y to the left, all other terms to the right
-5y=9.5
y=9.5/-5
y=-1+3/3.3333333333333
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