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4000/x-400=400
We move all terms to the left:
4000/x-400-(400)=0
Domain of the equation: x!=0We add all the numbers together, and all the variables
x∈R
4000/x-800=0
We multiply all the terms by the denominator
-800*x+4000=0
We add all the numbers together, and all the variables
-800x+4000=0
We move all terms containing x to the left, all other terms to the right
-800x=-4000
x=-4000/-800
x=+5
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