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0.13(x+3000)=6890
We move all terms to the left:
0.13(x+3000)-(6890)=0
We multiply parentheses
0.13x+390-6890=0
We add all the numbers together, and all the variables
0.13x-6500=0
We move all terms containing x to the left, all other terms to the right
0.13x=6500
x=6500/0.13
x=50000
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