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50=20-y
We move all terms to the left:
50-(20-y)=0
We add all the numbers together, and all the variables
-(-1y+20)+50=0
We get rid of parentheses
1y-20+50=0
We add all the numbers together, and all the variables
y+30=0
We move all terms containing y to the left, all other terms to the right
y=-30
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