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A-b=18
A+b=66
A=?
B=?.


Răspuns :

a-b=18=> a=18+b
18+b+b=66
=>2b=66-18=48
=>b=48/2=24
=> a=b+18=24+18=42

Răspuns:

a=18+b

18+b+b=66

18+2b=66

2b=66-18

2b=48

b=48÷2

b=24

a=24+18

a=42