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720/(x-6)-720/x=6
We move all terms to the left:
720/(x-6)-720/x-(6)=0
Domain of the equation: (x-6)!=0
We move all terms containing x to the left, all other terms to the right
x!=6
x∈R
Domain of the equation: x!=0We calculate fractions
x∈R
720x/(x^2-6x)+(-720x+4320)/(x^2-6x)-6=0
We multiply all the terms by the denominator
720x+(-720x+4320)-6*(x^2-6x)=0
We multiply parentheses
-6x^2+720x+(-720x+4320)+36x=0
We get rid of parentheses
-6x^2+720x-720x+36x+4320=0
We add all the numbers together, and all the variables
-6x^2+36x+4320=0
a = -6; b = 36; c = +4320;
Δ = b2-4ac
Δ = 362-4·(-6)·4320
Δ = 104976
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{104976}=324$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(36)-324}{2*-6}=\frac{-360}{-12} =+30 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(36)+324}{2*-6}=\frac{288}{-12} =-24 $
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