-3(0,2x+0,4y)+2(1,6x+2,8y)

-3(0,2х+0,4у)+2(1,6х+2,8у)=-0,6х-1,2у+3,2х+5,6у=2,6х+4,4у (2,6х+4,4у)/2=1,3х+2,2у