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0.12(x+2000)=5640
We move all terms to the left:
0.12(x+2000)-(5640)=0
We multiply parentheses
0.12x+240-5640=0
We add all the numbers together, and all the variables
0.12x-5400=0
We move all terms containing x to the left, all other terms to the right
0.12x=5400
x=5400/0.12
x=45000
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