Mashaal Masha
$f(x)=\frac{(x+7)}{4}$

For the function $f$ defined above, what is the value of $f(9)-f(1)$?
Difficulty: Medium
A: 

1

B: 

2

C: 

$\dfrac{1}{4}$

D: 

$\dfrac{9}{4}$

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