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1000=0.7x+0.33x+x
We move all terms to the left:
1000-(0.7x+0.33x+x)=0
We add all the numbers together, and all the variables
-(+2.03x)+1000=0
We get rid of parentheses
-2.03x+1000=0
We move all terms containing x to the left, all other terms to the right
-2.03x=-1000
x=-1000/-2.03
x=492+1/1.6370967741934
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