6m+m-35=21 17n+14n-154
17n+14n-154 ? а скольким равно?
= 134
6m + m - 35 = 21 7m = 21 + 35 7m = 56 m = 56 / 7 m = 8 17n + 14n - 154= 134 31n = 134 + 154 31n = 288 n = 288 / 31 n = 9