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3y-4+0.2y=15+1.2y+21
We move all terms to the left:
3y-4+0.2y-(15+1.2y+21)=0
We add all the numbers together, and all the variables
3y+0.2y-(1.2y+36)-4=0
We add all the numbers together, and all the variables
3.2y-(1.2y+36)-4=0
We get rid of parentheses
3.2y-1.2y-36-4=0
We add all the numbers together, and all the variables
2y-40=0
We move all terms containing y to the left, all other terms to the right
2y=40
y=40/2
y=20
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