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21y+4=50y+2
We move all terms to the left:
21y+4-(50y+2)=0
We get rid of parentheses
21y-50y-2+4=0
We add all the numbers together, and all the variables
-29y+2=0
We move all terms containing y to the left, all other terms to the right
-29y=-2
y=-2/-29
y=2/29
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