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0.1x+0.11(8000-x)=820
We move all terms to the left:
0.1x+0.11(8000-x)-(820)=0
We add all the numbers together, and all the variables
0.1x+0.11(-1x+8000)-820=0
We multiply parentheses
0.1x-0.11x+880-820=0
We add all the numbers together, and all the variables
-0.01x+60=0
We move all terms containing x to the left, all other terms to the right
-0.01x=-60
x=-60/-0.01
x=+6000
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