Explicație pas cu pas:
[tex] \frac{2x + 5}{x - 1} [/tex]
x-1 / 2x+5
x-1 / x-1 /×2 => x-1 / 2x-2
___________________(-)
x-1 / 2x+5-2x+2
x-1 / 7
x-1 apartine D7
x-1 apartine {-7,-1,1,7} / +1
x aparține {-6,0,2,8}
