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2y-21=4y+5
We move all terms to the left:
2y-21-(4y+5)=0
We get rid of parentheses
2y-4y-5-21=0
We add all the numbers together, and all the variables
-2y-26=0
We move all terms containing y to the left, all other terms to the right
-2y=26
y=26/-2
y=-13
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