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6000=x+2x
We move all terms to the left:
6000-(x+2x)=0
We add all the numbers together, and all the variables
-(+3x)+6000=0
We get rid of parentheses
-3x+6000=0
We move all terms containing x to the left, all other terms to the right
-3x=-6000
x=-6000/-3
x=+2000
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