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D( x )
x+19 = 0
x+19 = 0
x+19 = 0
x+19 = 0 // - 19
x = -19
x in (-oo:-19) U (-19:+oo)
19.6 = 432/(x+19) // - 432/(x+19)
19.6-(432/(x+19)) = 0
19.6-432*(x+19)^-1 = 0
19.6-432/(x+19) = 0
(19.6*(x+19))/(x+19)-432/(x+19) = 0
19.6*(x+19)-432 = 0
19.6*x-59.6 = 0
(19.6*x-59.6)/(x+19) = 0
(19.6*x-59.6)/(x+19) = 0 // * x+19
19.6*x-59.6 = 0
19.6*x-59.6 = 0 // + 59.6
19.6*x = 59.6 // : 19.6
x = 59.6/19.6
x = 3.04081633
x = 3.04081633
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