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0.04x+0.06(x+3000)=780
We move all terms to the left:
0.04x+0.06(x+3000)-(780)=0
We multiply parentheses
0.04x+0.06x+180-780=0
We add all the numbers together, and all the variables
0.1x-600=0
We move all terms containing x to the left, all other terms to the right
0.1x=600
x=600/0.1
x=6000
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