x- （x-1）/3 = - [(x+3）/5 -7]
(3x - x + 1) /3 = 7 - (x + 3)/5
5 (2x +1) = 7*15 - 3(x + 3)
10x + 5 = 105 - 3x - 9
13x = 91
x = 7
x- （x-1）/3 = 5
（x+3）/5 -7 = -5