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=-7/2Y+21
We move all terms to the left:
-(-7/2Y+21)=0
Domain of the equation: 2Y+21)!=0We get rid of parentheses
Y∈R
7/2Y-21=0
We multiply all the terms by the denominator
-21*2Y+7=0
Wy multiply elements
-42Y+7=0
We move all terms containing Y to the left, all other terms to the right
-42Y=-7
Y=-7/-42
Y=1/6
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