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.07x+.065(15000-x)=1020
We move all terms to the left:
.07x+.065(15000-x)-(1020)=0
We add all the numbers together, and all the variables
.07x+.065(-1x+15000)-1020=0
We multiply parentheses
.07x-0.065x+975-1020=0
We add all the numbers together, and all the variables
0.005x-45=0
We move all terms containing x to the left, all other terms to the right
0.005x=45
x=45/0.005
x=9000
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