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1000=x+0.3x
We move all terms to the left:
1000-(x+0.3x)=0
We add all the numbers together, and all the variables
-(+1.3x)+1000=0
We get rid of parentheses
-1.3x+1000=0
We move all terms containing x to the left, all other terms to the right
-1.3x=-1000
x=-1000/-1.3
x=769+0.29999999999995/1.3
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