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