Question

х+23=72 х-36=45.
48+х=83

Answer 1

1) х+23=72
 х = 72 -23
х = 49

2) х-36=45.
х = 45+36
х =81

3) 48+х=83
х = 83-48
х= 35

Answer 2

х+23=72
х=72-23
х=49
-------------
х-36=45
х=45+36
х=81
-------------
48+х=83
х=83-48
х=35