2 2х 7 4 3 5х 2 July 8, 2019 16 32 64 128 2 2х 3 3 7 5х 4 2 х 2х 4 5х 3 )= 21 7 3х 2 7 2х-5 4 7 2х+5 4=-3 6-5 4 2≤х 5 3/7 2(7х − 7) = 7(2х − 3)+7
