Răspuns :
(x+13):3+22=30 <=> (x+13):3=30-22 <=> (x+13):3=8 <=> x+13=8•3 <=> x+13=24 <=> x=24-13 <=> x=11.
a= nr la care ma gandesc
(a+13):3+22=30
(a+13):3=30-22
(a+13):3=8
a+13=8x3
a+13=24
a=24-13
a=11
(a+13):3+22=30
(a+13):3=30-22
(a+13):3=8
a+13=8x3
a+13=24
a=24-13
a=11