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=20+0.8Y+70
We move all terms to the left:
-(20+0.8Y+70)=0
We add all the numbers together, and all the variables
-(0.8Y+90)=0
We get rid of parentheses
-0.8Y-90=0
We move all terms containing Y to the left, all other terms to the right
-0.8Y=90
Y=90/-0.8
Y=-112+0.39999999999999/0.8
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