math help with dex-requiring equips.

ok guys, as you may know, i've been getting agares equips all around, now i've reached the biggest problem, which is equipping them all, i need help figuring out how much extra dex i would need to be able to equip them, their dex requirement in parenthesis, and +dex below:

cape, (0)
+3

glove (140)
+9

Shoe (140)
+9

overall (160)
+14

Helmet (160)
+18

Weapon (160)
+4

now, outside sources of dex amount to a total of +114 dex (not counting 4 dex base) and i have a czak worth 47 dex, and a top+bottom combo worth 31 dex.

so far i can equip all but the helmet, with 5 pieces and the CZAK helmet, i have a total of 214 dex, how much extra dex would i need to be able to unequip the helmet, and still keep the other 5 pieces on? (if i unequip the helm, the weapon+overall red out)

also, taking into account how much the helmet gives, and the bonus +15 all stat from the full set, what number would i be able to lower my dex to, in order to have everything equipped?