Răspuns :
[tex]a = b + 7 \\ b + 7 + b = 3971 \\ 2 \times b + 7 = 3971 \\ 2 \times b = 3964 \\ b = 1982 \\ a + 1982 = 3971 \\ a = 1989[/tex]
a-b=7=>a=b+7
a+b=3971=>b+7+b=3971=>2b=3971-7=>2b=3964=>b=3964:2=>b=1982
a=b+7=>a=1982+7=>a=1989
Sper ca te-am ajutat
a+b=3971=>b+7+b=3971=>2b=3971-7=>2b=3964=>b=3964:2=>b=1982
a=b+7=>a=1982+7=>a=1989
Sper ca te-am ajutat