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800/x=40
We move all terms to the left:
800/x-(40)=0
Domain of the equation: x!=0We multiply all the terms by the denominator
x∈R
-40*x+800=0
We add all the numbers together, and all the variables
-40x+800=0
We move all terms containing x to the left, all other terms to the right
-40x=-800
x=-800/-40
x=+20
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