4-x？ ≥0②
x-2≠0③
Can you get x from ① and ②? -4=0
The solution is x = 2.
Get x≠2 from ③.
∴x=-2
When x =-2 and y = (0+0+1)/-2-2 =-1/4.
Original formula =3×(-2)+4×(- 1/4)
=-6- 1
=-7
Please ask again if you don't understand.