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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
171/(x-4)+3 = 60 // - 60
171/(x-4)-60+3 = 0
171/(x-4)+(-60*(x-4))/(x-4)+(3*(x-4))/(x-4) = 0
3*(x-4)-60*(x-4)+171 = 0
3*x-60*x-12+411 = 0
399-57*x = 0
(399-57*x)/(x-4) = 0
(399-57*x)/(x-4) = 0 // * x-4
399-57*x = 0
399-57*x = 0 // - 399
-57*x = -399 // : -57
x = -399/(-57)
x = 7
x = 7
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