37-3х=22
-3х = 22 - 37
-3х = - 15
х = 5
(х+2):7=9
х+2 = 63
х = 61
8х-31=105
8х = 136
х = 17
8(а+7)-21=195
8(а+7) = 216
а + 7 = 27
а = 20
37-3х=22
-3х = 22 - 37
-3х = - 15
х = 5
(х+2):7=9
х+2 = 63
х = 61
8х-31=105
8х = 136
х = 17
8(а+7)-21=195
8(а+7) = 216
а + 7 = 27
а = 20