Thank you for the opportunity to help you with your question!
f(a) = 7a
f(a + h)= 7(a + h)
(f(a + h) - f(a) )/ h = (7(a + h) - 7a )/ h = 7a + 7h - 7a / h = 7
and writ the right question if therse not your question i will answer
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