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Estabelecer os limites a partir da definiçao:

a. lim
x→1 (5x − 3) = 2

b. lim
x→2
(5x − 3) = 7

c. lim
x→−6
(10 − 9x) = 64

d. lim
x→5 (x/4+2) = 13/4