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x+(.4x)=500
We move all terms to the left:
x+(.4x)-(500)=0
We add all the numbers together, and all the variables
x+(+.4x)-500=0
We get rid of parentheses
x+.4x-500=0
We add all the numbers together, and all the variables
1.4x-500=0
We move all terms containing x to the left, all other terms to the right
1.4x=500
x=500/1.4
x=357+0.2/1.4
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