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=-0.8Y+3.5
We move all terms to the left:
-(-0.8Y+3.5)=0
We get rid of parentheses
0.8Y-3.5=0
We move all terms containing Y to the left, all other terms to the right
0.8Y=3.5
Y=3.5/0.8
Y=4+0.3/0.8
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