Răspuns :
a-b=5.6 rezulta ca a este 5.6+b
a+b=10.4
5.6+b+b=10.4
2b=10.4-5.6
2b=4.8
b=2.4
a=5.6+2.4=8
a+b=10.4
5.6+b+b=10.4
2b=10.4-5.6
2b=4.8
b=2.4
a=5.6+2.4=8