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0.13(x+3000)=6240
We move all terms to the left:
0.13(x+3000)-(6240)=0
We multiply parentheses
0.13x+390-6240=0
We add all the numbers together, and all the variables
0.13x-5850=0
We move all terms containing x to the left, all other terms to the right
0.13x=5850
x=5850/0.13
x=45000
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