2х=13+15
2x=28
x=28:2
х=14
7y-25=45
7y=45+25
7у=70
у=10
130-4x=70
-4х=70+130
-4х=200
х=-50
49-3х=34
-3х=-15
х=5
9у-89=55
9у=144
у=16
74-8z=2
-8z=-72
z=-72:(-8)
z=8
2х=13+15
2x=28
x=28:2
х=14
7y-25=45
7y=45+25
7у=70
у=10
130-4x=70
-4х=70+130
-4х=200
х=-50
49-3х=34
-3х=-15
х=5
9у-89=55
9у=144
у=16
74-8z=2
-8z=-72
z=-72:(-8)
z=8