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x+0.07x=4000
We move all terms to the left:
x+0.07x-(4000)=0
We add all the numbers together, and all the variables
1.07x-4000=0
We move all terms containing x to the left, all other terms to the right
1.07x=4000
x=4000/1.07
x=3738+0.33999999999969/1.07
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