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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)
2/(x+19) = 69 // - 69
2/(x+19)-69 = 0
2/(x+19)+(-69*(x+19))/(x+19) = 0
2-69*(x+19) = 0
-69*x-1309 = 0
(-69*x-1309)/(x+19) = 0
(-69*x-1309)/(x+19) = 0 // * x+19
-69*x-1309 = 0
-69*x-1309 = 0 // + 1309
-69*x = 1309 // : -69
x = 1309/(-69)
x = -1309/69
x = -1309/69
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