a-pierwsza liczba
b-druga liczba
a+b=21
a+3=b
a-b=3
_____
2a = 24
a = 12
b=9
1 liczba --- x
2 liczba --- x + 3
x + x + 3 = 21
2x = 21 - 3
2x = 18
x = 9
1 liczba --- x = 9
2 liczba --- x + 3 = 9 + 3 = 12
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a-pierwsza liczba
b-druga liczba
a+b=21
a+3=b
a+b=21
a-b=3
_____
2a = 24
a = 12
b=9
1 liczba --- x
2 liczba --- x + 3
x + x + 3 = 21
2x = 21 - 3
2x = 18
x = 9
1 liczba --- x = 9
2 liczba --- x + 3 = 9 + 3 = 12