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0.04x+0.09(100000-x)=5000
We move all terms to the left:
0.04x+0.09(100000-x)-(5000)=0
We add all the numbers together, and all the variables
0.04x+0.09(-1x+100000)-5000=0
We multiply parentheses
0.04x-0.09x+9000-5000=0
We add all the numbers together, and all the variables
-0.05x+4000=0
We move all terms containing x to the left, all other terms to the right
-0.05x=-4000
x=-4000/-0.05
x=+80000
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