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0.8x+x=646000
We move all terms to the left:
0.8x+x-(646000)=0
We add all the numbers together, and all the variables
1.8x-646000=0
We move all terms containing x to the left, all other terms to the right
1.8x=646000
x=646000/1.8
x=358888+1/1.1250000000164
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