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=Y+2.5Y-4=-3
We move all terms to the left:
-(Y+2.5Y-4)=0
We add all the numbers together, and all the variables
-(3.5Y-4)=0
We get rid of parentheses
-3.5Y+4=0
We move all terms containing Y to the left, all other terms to the right
-3.5Y=-4
Y=-4/-3.5
Y=1+0.5/3.5
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