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0.03x+0.12(x+9000)=1980
We move all terms to the left:
0.03x+0.12(x+9000)-(1980)=0
We multiply parentheses
0.03x+0.12x+1080-1980=0
We add all the numbers together, and all the variables
0.15x-900=0
We move all terms containing x to the left, all other terms to the right
0.15x=900
x=900/0.15
x=6000
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