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=-2.129.75Y+21.028.35
We move all terms to the left:
-(-2.129.75Y+21.028.35)=0
We add all the numbers together, and all the variables
-(-1.59675Y+7.3598)=0
We get rid of parentheses
1.59675Y-7.3598=0
We move all terms containing Y to the left, all other terms to the right
1.59675Y=7.3598
Y=7.3598/1.59675
Y=4+0.9728/1.59675
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