-3, 7*(2, 5x-7, 6) =-3, 66+2, 1x

Решение: -3, 7*(2, 5x-7, 6) = -3, 66+2, 1x -3, 14x - 49, 42 = -3, 68 + 1x -3, 14x - 49, 42 = -3, 68 + x 14x - 49, 42 = 68 - 3 + x 14x - 49, 42 = 65 + x 13x = 114, 42 x = 8, 80