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.12y+.09(y+7000)=2310
We move all terms to the left:
.12y+.09(y+7000)-(2310)=0
We multiply parentheses
.12y+0.09y+630-2310=0
We add all the numbers together, and all the variables
0.21y-1680=0
We move all terms containing y to the left, all other terms to the right
0.21y=1680
y=1680/0.21
y=8000
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