+attack lines on a weapon and lucky seven calculation.

I was browsing through formula threads and wondering how a rare weapon's modifiers factor into the lucky star calculation.

So far, this is the understanding that I have for the lucky seven calculation :

1.80*(4 * LUK + DEX) * (Weapon Attack / 100)


where weapon attack is sum addition of all +atk modifiers you have on your equipment.

Following this logic, if a claw had something like :

weap atk : 30

and plus three lines that read :

attk : +5
attk : +5
luk : +2

then the weapon is essentially the same as weap atk : 40.

Is this line of thinking correct? Please help clarify this issue for me.

Thank you in advance