Răspuns :
a-nr initial
T=?
a+13-15+2
a+13+2=15
a+2=15-13=2
a=2+2
a=4
T-> 4+13-15+2=17-15+2=2+2=4=> T=4
T=?
a+13-15+2
a+13+2=15
a+2=15-13=2
a=2+2
a=4
T-> 4+13-15+2=17-15+2=2+2=4=> T=4