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+21=2Y-24
We move all terms to the left:
+21-(2Y-24)=0
We get rid of parentheses
-2Y+24+21=0
We add all the numbers together, and all the variables
-2Y+45=0
We move all terms containing Y to the left, all other terms to the right
-2Y=-45
Y=-45/-2
Y=22+1/2
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