(10y+2•(7y-2)):5=(5•(4y+3)+3y):5
(10y+2•(7y-2)):5=(5•(4y+3)+3y):5 (10y+14y-4)/5=(20y+15+3y)/5 (24y-4)/5=(23y+15)/5|*5 24y-4=23y+15 24y-23y=15+4 y=19