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4y+5=2y+4=11y-21
We move all terms to the left:
4y+5-(2y+4)=0
We get rid of parentheses
4y-2y-4+5=0
We add all the numbers together, and all the variables
2y+1=0
We move all terms containing y to the left, all other terms to the right
2y=-1
y=-1/2
y=-1/2
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