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345=3.5y+2.25y
We move all terms to the left:
345-(3.5y+2.25y)=0
We add all the numbers together, and all the variables
-(+5.75y)+345=0
We get rid of parentheses
-5.75y+345=0
We move all terms containing y to the left, all other terms to the right
-5.75y=-345
y=-345/-5.75
y=+60
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