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a+b =124
3a =b
a=? b=?


Răspuns :

a+b=124;
a+3a=124
⇒4a=124
⇒a=124/4
⇒a=31;
⇒b=3·31
⇒b=93;
a+b=124
3a=b
inlocuiesti in problema initiala:
(in loc de b, pui 3a)
a + 3a=124
4a=124
a=124 : 4 -> a= 31
b= 3a=> b =3 x 31 => b=93