a-b = 15
a:b = 15-11 = 4 => a= 4b
4b-b = 15 <=> 3b = 15/:3 <=> b = 5
a-5 = 15 <=> a = 15+5 <=> a = 20
a = primul număr
b = al doilea număr
a - b = 15
a : b = 15 - 11
a : b = 4
a = 4 × b
4 × b - b = 15
3 × b = 15 | : 3
b = 5
a = 4 × 5
a = 20
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a-b = 15
a:b = 15-11 = 4 => a= 4b
4b-b = 15 <=> 3b = 15/:3 <=> b = 5
a-5 = 15 <=> a = 15+5 <=> a = 20
a = primul număr
b = al doilea număr
a - b = 15
a : b = 15 - 11
a : b = 4
a = 4 × b
4 × b - b = 15
3 × b = 15 | : 3
b = 5
a = 4 × 5
a = 20