Hi, I’ve use RB750 with 2 Fibre Internet - 1 can bridge and 1 can’t.
Anyone can made script for me, i try all at night for config this but it can’t to use 
WAN 1 : Fibre 1 (20/10) - PPPoE (Bridge)
WAN 2 : Fibre 2 (20/07) - STATIC (Can’t Bridge)
** WAN1 + WAN2 - PCC LOAD BALANCE **
LAN 3 - 5 : LAN
Thank’s in advanced 