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0.05x+0.13(x+4000)=1780
We move all terms to the left:
0.05x+0.13(x+4000)-(1780)=0
We multiply parentheses
0.05x+0.13x+520-1780=0
We add all the numbers together, and all the variables
0.18x-1260=0
We move all terms containing x to the left, all other terms to the right
0.18x=1260
x=1260/0.18
x=7000
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