1)
3(5х+2у)+7=3х +19
2х+8=3-(2х+5у)
15x+6y-3x-19=0
2x+8-3+2x+5y=0
12x+6y-19=0
4x+5y+5=0 (*-3)
-12-15y-15=0
-9y-34=0
-9y=34
y=-3,7
1)
3(5х+2у)+7=3х +19
2х+8=3-(2х+5у)
15x+6y-3x-19=0
2x+8-3+2x+5y=0
12x+6y-19=0
4x+5y+5=0 (*-3)
12x+6y-19=0
-12-15y-15=0
-9y-34=0
-9y=34
y=-3,7