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D( x )
x+13 = 0
x+13 = 0
x+13 = 0
x+13 = 0 // - 13
x = -13
x in (-oo:-13) U (-13:+oo)
0.963 = (x+12)/(x+13) // - (x+12)/(x+13)
0.963-((x+12)/(x+13)) = 0
(-1*(x+12))/(x+13)+0.963 = 0
(-1*(x+12))/(x+13)+(0.963*(x+13))/(x+13) = 0
0.963*(x+13)-1*(x+12) = 0
0.519-0.037*x = 0
(0.519-0.037*x)/(x+13) = 0
(0.519-0.037*x)/(x+13) = 0 // * x+13
0.519-0.037*x = 0
0.519-0.037*x = 0 // - 0.519
-0.037*x = -0.519 // : -0.037
x = -0.519/(-0.037)
x = 14.02702703
x = 14.02702703
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