2цел3\7X+6цел4\7X =-18 Уравнение
17/7x+46/7x=-18; 63/7x=-18; x=-18/63/7; x=-2.
17/7Х+46/7Х=-18 63/7Х=-18 Х=-18*7/63 Х=-126/63=- 2