{x+4y/9-x-2y/3=0 {x+7y/4+x+y/6=4

{x+4y/9-x-2y/3=0|*9 {x+7y/4+x+y/6=4|*12{9x+4y-9x-6y=0{12x+21y+12x+2y=48{0x-2y=0|*23{24x+23y=48|*2+{0x-46y=0+{48x+46y=9648x=96|:48x=20*2-46y=0-46y=0|:(-46)y=0