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0.6666666667=x+2x
We move all terms to the left:
0.6666666667-(x+2x)=0
We add all the numbers together, and all the variables
-(+3x)+0.6666666667=0
We get rid of parentheses
-3x+0.6666666667=0
We move all terms containing x to the left, all other terms to the right
-3x=-0.6666666667
x=-0.6666666667/-3
x=0.6666666667/3
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