equ is from Latin word "aequus" -- meaning "equal"
"ex" means out/outside, "extra" means outside/except/without, both originate from Latin.
cred originates from Latin word crēdere, means "to believe."
Prefix "sym" or "syn" originates from Greek, meaning with or together with. The prefix can also be "sy" or "syl" in spelling.
it originates from Latin verb dūcere, meaning "lead"