Tìm x: 64.2^x - 2 = 2^2020

Tim x :
a, 64 . 2^x - 2 = 2^2020
b, 21 + 3 . |x| = 3 . ( 4^2 - 1 )
mong cac ban giup, minh CAN GAP LAM luon !!!!!