Middling Opportunity Help

[LordBP]

I'm a new sports better looking for opportunities.

Say I find a line with this:

Pats -5.5 (-120)

and

Dolphins +7 (-130)

Then how do I tell if it's worth it to bet the middle. If the Pats win by 6 I hit both and if they win by 7 I hit one and push one.

Thanks.


Edit: I guess I'm asking if there is some sort of formula to determine the chance of the middle happening and taking into account the juice.