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+50=2Y-20
We move all terms to the left:
+50-(2Y-20)=0
We get rid of parentheses
-2Y+20+50=0
We add all the numbers together, and all the variables
-2Y+70=0
We move all terms containing Y to the left, all other terms to the right
-2Y=-70
Y=-70/-2
Y=+35
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