17 х - х + 5 х =170 +19
21 х = 189
х = 189 : 21
х = 9
Проверка
17 х 9 - 9 + 5 х 9 - 19 = 170
170 = 170
17 х 9 - 9 +5 х 9 - 19 = 153 - 9 +45 - 19 = 144+45 = 19 = 189 - 19 = 170
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17 х - х + 5 х =170 +19
21 х = 189
х = 189 : 21
х = 9
Проверка
17 х 9 - 9 + 5 х 9 - 19 = 170
170 = 170
17 х 9 - 9 +5 х 9 - 19 = 153 - 9 +45 - 19 = 144+45 = 19 = 189 - 19 = 170