Răspuns :
a-c=3=>a=3+c
b=-5
3a+2b-3c= 3(3+c)+2b-3c
=9+3c+ (-10) -3c (+3c si -3c se reduc)
=9-10
=-1
R: -1
b=-5
3a+2b-3c= 3(3+c)+2b-3c
=9+3c+ (-10) -3c (+3c si -3c se reduc)
=9-10
=-1
R: -1