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0.15x+0.05(x+4000)=1600
We move all terms to the left:
0.15x+0.05(x+4000)-(1600)=0
We multiply parentheses
0.15x+0.05x+200-1600=0
We add all the numbers together, and all the variables
0.2x-1400=0
We move all terms containing x to the left, all other terms to the right
0.2x=1400
x=1400/0.2
x=7000
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