Răspuns :
{(a+3)x7+48}=44
(a+3)x7+48}=44x3
(a+3)x7+48=132
(a+3)x7=132-48
(a+3)x7=84
A+3=84:7
A+3=12
A=12-3
A=9
{[a+3]x7+48}= 44x3
{[a+3]x7+48}= 132
[a+3]x7=132-48
[a+3]x7=84
a+3=84:7
a+3=12
a=12-3
a=9
{[a+3]x7+48}= 132
[a+3]x7=132-48
[a+3]x7=84
a+3=84:7
a+3=12
a=12-3
a=9