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=0.75Y+4.21
We move all terms to the left:
-(0.75Y+4.21)=0
We get rid of parentheses
-0.75Y-4.21=0
We move all terms containing Y to the left, all other terms to the right
-0.75Y=4.21
Y=4.21/-0.75
Y=-5+0.46/0.75
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