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0.12+0.03(y+4000)=720
We move all terms to the left:
0.12+0.03(y+4000)-(720)=0
We add all the numbers together, and all the variables
0.03(y+4000)-719.88=0
We multiply parentheses
0.03y+120-719.88=0
We add all the numbers together, and all the variables
0.03y-599.88=0
We move all terms containing y to the left, all other terms to the right
0.03y=599.88
y=599.88/0.03
y=19996
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