у= 4/5
-3х•3=5х-12
-3х-(-5х)=-3-(-12)
2х=9 ÷/2
х=4,5
2•(-0,4у)-(-3,6у)=1,4у-1
-0,8у-(-3,6у)-1,4у=-1
1,4у=-1
у=-5/7
у= 4/5
-3х•3=5х-12
-3х-(-5х)=-3-(-12)
2х=9 ÷/2
х=4,5
2•(-0,4у)-(-3,6у)=1,4у-1
-0,8у-(-3,6у)-1,4у=-1
1,4у=-1
у=-5/7