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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-2 = (15/6)*x+x // - (15/6)*x+x
10/x-((15/6)*x)-x-2 = 0
(-5/2)*x-x+10/x-2 = 0
10*x^-1-7/2*x^1-2*x^0 = 0
(10*x^0-7/2*x^2-2*x^1)/(x^1) = 0 // * x^2
x^1*(10*x^0-7/2*x^2-2*x^1) = 0
x^1
(-7/2)*x^2-2*x+10 = 0
(-7/2)*x^2-2*x+10 = 0
DELTA = (-2)^2-(4*10*(-7/2))
DELTA = 144
DELTA > 0
x = (144^(1/2)+2)/(2*(-7/2)) or x = (2-144^(1/2))/(2*(-7/2))
x = -2 or x = 10/7
x in { -2, 10/7}
x in { -2, 10/7 }
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