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0.03x+0.18(x+2000)=1620
We move all terms to the left:
0.03x+0.18(x+2000)-(1620)=0
We multiply parentheses
0.03x+0.18x+360-1620=0
We add all the numbers together, and all the variables
0.21x-1260=0
We move all terms containing x to the left, all other terms to the right
0.21x=1260
x=1260/0.21
x=6000
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