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21+3y-4=4+16y-24
We move all terms to the left:
21+3y-4-(4+16y-24)=0
We add all the numbers together, and all the variables
3y-(16y-20)+21-4=0
We add all the numbers together, and all the variables
3y-(16y-20)+17=0
We get rid of parentheses
3y-16y+20+17=0
We add all the numbers together, and all the variables
-13y+37=0
We move all terms containing y to the left, all other terms to the right
-13y=-37
y=-37/-13
y=2+11/13
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