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x+(.4x)=500000
We move all terms to the left:
x+(.4x)-(500000)=0
We add all the numbers together, and all the variables
x+(+.4x)-500000=0
We get rid of parentheses
x+.4x-500000=0
We add all the numbers together, and all the variables
1.4x-500000=0
We move all terms containing x to the left, all other terms to the right
1.4x=500000
x=500000/1.4
x=357142+1/1.1666666666553
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