Question

8х+7х-х=42 дуже треба

Answer 1

8х + 7х - х = 42
14x = 42
x = 42 : 14
x = 3

проверка:  8 * 3 + 7 * 3 - 3 = 24 + 21 - 3 = 45 - 3 = 42,   42 = 42