Mark M. answered 09/19/18
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Retired math prof. Calc 1, 2 and AP Calculus tutoring experience.
limx→-5 [(x+5) / (x2+7x+10)] (has the form 0/0)
= limx→-5 [(x+5) / ((x+5)(x+2))]
= limx→-5 [1 / (x+2)] = -1/3