Question

aflati x se include z astfel incit 7 supra x-3 se include Z

Answer 1

7/ (x-3) ∈ Z ⇒ (x-3) | 7 (divide)
⇒ x-3 ∈ {-7,-1,1,7)
x-3= -7 ⇒ x=-4
x-3=-1 ⇒ x=2
x-3= 1 ⇒ x=4
x-3=7 ⇒ x=10

O seara buna!