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0.3x+x=9000
We move all terms to the left:
0.3x+x-(9000)=0
We add all the numbers together, and all the variables
1.3x-9000=0
We move all terms containing x to the left, all other terms to the right
1.3x=9000
x=9000/1.3
x=6923+0.1/1.3
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