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f(3 + h) = 6(3 + h) + 4 = 18 + 6h + 4 = 6h + 22
f(3) = 6(3) + 4 = 22
Lim (f(3 + h) - f(3)) / h
= Lim (6h + 22) - (22) / h
= Lim (6h)/h
= 6