Dau coroana!! AM NEVOIE REPEDE

[tex]\frac{x+6}{x-1}[/tex]∈Z ⇔
x-1 Ι x+6
x-1 Ι x-1
⇒x-1 Ι (x+6)-(x-1)
⇒x-1 Ι 7
x-1∈{-7,-1,1,7}
x∈{-6,0,2,8}
S=-6+0+2+8=4