Răspuns :
n - numărul necunoscut
Răspuns:
[(n+5)x5-5]:5=5
[(n+5)x5-5]=5x5
(n+5)x5-5=25
(n+5)X5=25+5
(n+5)X5=30
(n+5)=30:5
n+5=6
n=6-5
n=1
[(x+5x5-5]:5=5
[(x+5x5-5]=5x5
(x+5)x5-5=25
(x+5)X5=25+5
(x+5)X5=30
(x+5)=30:5
x+5=6
x=6-5
x=1
☆Sper că te-am ajutat☆