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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(4*x)+(7/5)*x-(1/x)-10+2 = 0
x-4*x+(7/5)*x-x^-1-10+2 = 0
-8/5*x^1-1*x^-1-8*x^0 = 0
(-8/5*x^2-8*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(-8/5*x^2-8*x^1-1*x^0) = 0
x^1
(-8/5)*x^2-8*x-1 = 0
(-8/5)*x^2-8*x-1 = 0
DELTA = (-8)^2-(-1*4*(-8/5))
DELTA = 288/5
DELTA > 0
x = ((288/5)^(1/2)+8)/(2*(-8/5)) or x = (8-(288/5)^(1/2))/(2*(-8/5))
x = -5/16*((288/5)^(1/2)+8) or x = -5/16*(8-(288/5)^(1/2))
x in { -5/16*((288/5)^(1/2)+8), -5/16*(8-(288/5)^(1/2))}
x in { -5/16*((288/5)^(1/2)+8), -5/16*(8-(288/5)^(1/2)) }
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