Bonjour
(E1) : 4/(x-1) - 3/(x-2) = -1
(E1) : 4/(x-1) - 3/(x-2) + 1 = 0
(E1) : (4(x-2)-3(x-1)+(x-1)(x-2))/((x-1)(x-2))= 0
(E1) : (4x-8-3x-3+x**2-2x-x+2)/((x-1)(x-2))= 0
(E1) : (-2x-3+x**2)/((x-1)(x-2))= 0
(E1) : x**2 - 2x - 3 = 0
(E1) : x**2 + x - 2x - 3 = 0
(E1) : x(x+1)-3(x+1) = 0
(E1) : (x+1)(x-3) = 0
- (x+1) = 0
x = -1
- (x-3) = 0
x = 3