помогите пожалуйста решить уравнение 5/7:(6/7х+3/7)-1/2=1/6

5/7 : (6/7 х +3/7) - 1/2 = 1/65/7 : (6/7 х + 3/7) = 1/6 + 1/25/7 : (6/7 х + 3/7) = 1/6 + 3/65/7 : (6/7 х + 3/7) = 4/65/7 : (6/7 х + 3/7) = 2/36/7 х + 3/7 = 5/7 : 2/36/7 х + 3/7 = 5/7 * 3/26/7 х + 3/7 = 15/146/7 х = 15/14 - 3/76/7 х = 15/14 - 6/146/7 х = 9/14х = 9/14 : 6/7х = 9/14 * 7/6х = 3/4 или =0,75