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1.25x+0.75x+x=9000
We move all terms to the left:
1.25x+0.75x+x-(9000)=0
We add all the numbers together, and all the variables
3x-9000=0
We move all terms containing x to the left, all other terms to the right
3x=9000
x=9000/3
x=3000
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