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0.13x+0.03(70000-x)=6000
We move all terms to the left:
0.13x+0.03(70000-x)-(6000)=0
We add all the numbers together, and all the variables
0.13x+0.03(-1x+70000)-6000=0
We multiply parentheses
0.13x-0.03x+2100-6000=0
We add all the numbers together, and all the variables
0.1x-3900=0
We move all terms containing x to the left, all other terms to the right
0.1x=3900
x=3900/0.1
x=39000
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