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4000=x.8
We move all terms to the left:
4000-(x.8)=0
We add all the numbers together, and all the variables
-(+x.8)+4000=0
We get rid of parentheses
-x.8+4000=0
We move all terms containing x to the left, all other terms to the right
-x.8=-4000
x=-4000/1
x=-4000
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