Question

реши уравнение 2х-15=13,7у-25=45,130-4х=70,49-3х=34,9у-89=55,74-8z=2

Answer 1

2х-15=13 7у-25=45
2х=15+13 7у=45+25
2х=18 7у=70
х=18:2 у=10
х=9

Answer 2

2х=15+13=28÷2=14

Answer 3

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