1)2(х+у)-х+6=0
2х+2у-х+6=0
х+2у+6=0
х=-2у-6
3х-(х-у)=0
3х-х+у=0
2х+у=0
2х=-у
2)3(х+2у)-у-27=0
3х+6у-у-27=0
3х+5у-27=0
3х=-5у+27
+9
1)2(х+у)-х+6=0
2х+2у-х+6=0
х+2у+6=0
х=-2у-6
3х-(х-у)=0
3х-х+у=0
2х+у=0
2х=-у
2)3(х+2у)-у-27=0
3х+6у-у-27=0
3х+5у-27=0
3х=-5у+27
+9