Question

cum calculez 15supra x+7

Answer 1

$\frac{15}{x+7}$ , x+7∈{1,3,5,15};
1)x+7=1
x=-6
2)x+7=3
x=-3
3)x+7=5
x=-2
4)x+7=15
x=8
x∈{-6;-3;-2;8}