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=-3.1Y+7-7.4Y
We move all terms to the left:
-(-3.1Y+7-7.4Y)=0
We add all the numbers together, and all the variables
-(-10.5Y+7)=0
We get rid of parentheses
10.5Y-7=0
We move all terms containing Y to the left, all other terms to the right
10.5Y=7
Y=7/10.5
Y=7/10.5
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