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D( x )
1*x-65 = 0
1*x-65 = 0
1*x-65 = 0
x-65 = 0
x-65 = 0 // + 65
x = 65
x in (-oo:65) U (65:+oo)
(3*x-65)/(1*x-65) = 16 // - 16
(3*x-65)/(1*x-65)-16 = 0
(3*x-65)/(x-65)-16 = 0
(3*x-65)/(x-65)+(-16*(x-65))/(x-65) = 0
3*x-16*(x-65)-65 = 0
975-13*x = 0
(975-13*x)/(x-65) = 0
(975-13*x)/(x-65) = 0 // * x-65
975-13*x = 0
975-13*x = 0 // - 975
-13*x = -975 // : -13
x = -975/(-13)
x = 75
x = 75
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