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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
78/60 = 51/x // - 51/x
78/60-(51/x) = 0
78/60-51*x^-1 = 0
-51*x^-1 = -13/10 // : -51
x^-1 = 13/510
-1 < 0
1/(x^1) = 13/510 // * x^1
1 = 13/510*x^1 // : 13/510
510/13 = x^1
x = 510/13
x = 510/13
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