Calculating a Bijective Function: f(N0)

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Hi, i have this function f : x \in Q \rightarrow (5x-7)/6
the function is bijective now i need to calculate:
f(N0)
i get :
f(0)=-7/6, f(1)=-1/3, f(2)=1/2, f(3)=4/3, etc...
I need to generalize the set that include the image of f(N0),
but i don't know what could be.
 
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Let's not simplify the fraction. Then the denominator will always be 6. What can the numerator be?
 

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