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0.11x+0.02(x+9000)=830
We move all terms to the left:
0.11x+0.02(x+9000)-(830)=0
We multiply parentheses
0.11x+0.02x+180-830=0
We add all the numbers together, and all the variables
0.13x-650=0
We move all terms containing x to the left, all other terms to the right
0.13x=650
x=650/0.13
x=5000
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