x-2 ∈ D10
x-2 ∈ {1,2,5,10}
x∈{3,5,7,12} ⇒ A= {3,5,7,12}
2x+1 ∈{1,3,5,15}
2x∈{0,2,4,14}
x∈{0,1,2,7} ⇒ B={0,1,2,7}
2x-1 ∈{1,5,25}
2x ∈{2,6,26}
x∈{1,3,13} ⇒ C={1,3,13}
3x-1∈{1,3,11,33}
3x∈{2,4,12,34}
singurul nr natural care se imparte la 3 este 12
x∈ {4} ⇒ D = {4}
2x+1∈{1,2,7,14}
2x∈{0,1,6,13}
doar nr 0 si 6 se impart la 2
E={0,3}
x+5∈{1,2,4,7,14,28}
x trebuie sa fie nr natural deci x> 5
x∈{2,9,23} ⇒ F={2,9,23}
x-3 ∈{1,2,3,4,6,12}
x∈{4,5,6,7,9,15} ⇒ G={4,5,6,7,9,15}
