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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-60 = (60/7)*x // - (60/7)*x
10/x-((60/7)*x)-60 = 0
(-60/7)*x+10/x-60 = 0
10*x^-1-60/7*x^1-60*x^0 = 0
(10*x^0-60/7*x^2-60*x^1)/(x^1) = 0 // * x^2
x^1*(10*x^0-60/7*x^2-60*x^1) = 0
x^1
(-60/7)*x^2-60*x+10 = 0
(-60/7)*x^2-60*x+10 = 0
DELTA = (-60)^2-(4*10*(-60/7))
DELTA = 27600/7
DELTA > 0
x = ((27600/7)^(1/2)+60)/(2*(-60/7)) or x = (60-(27600/7)^(1/2))/(2*(-60/7))
x = -7/120*((27600/7)^(1/2)+60) or x = -7/120*(60-(27600/7)^(1/2))
x in { -7/120*((27600/7)^(1/2)+60), -7/120*(60-(27600/7)^(1/2))}
x in { -7/120*((27600/7)^(1/2)+60), -7/120*(60-(27600/7)^(1/2)) }
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