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0.07x+0.16(x+3000)=1400
We move all terms to the left:
0.07x+0.16(x+3000)-(1400)=0
We multiply parentheses
0.07x+0.16x+480-1400=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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