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0.05x+0.18(x+4000)=1640
We move all terms to the left:
0.05x+0.18(x+4000)-(1640)=0
We multiply parentheses
0.05x+0.18x+720-1640=0
We add all the numbers together, and all the variables
0.23x-920=0
We move all terms containing x to the left, all other terms to the right
0.23x=920
x=920/0.23
x=4000
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