Ответ Автор - LionDiego -3х + 14 = 4х + 56-3х - 4х = 56 - 14-7х = 42-х = 6х = -63/4х + 6 = 2/3х - 93/4х - 2/3х = -9 - 69/12х - 8/12х = -9 - 61/12х = -15х = -15 : 1/12х = -15 * 12х = 180