Question

Va rog sa ma ajutați

Answer 1

2(-x+1)=-6
-2x+2=-6
-2x= -8
x= 4

|2x-6|=0
2x=6
x= 3

3/(X+1)€Z ,DVA :R/{ -1{
X+1= -3 => X= -4
X+1= -1=> X= -2
X+1= 1=> X= 0
X+1= 3=> X=2
-4+(-2)+0+2= -4