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Układ równań:
x+y=13
x+3=y
x+y=13
x-y=-3 /*(-1)
x+y=13
-x+y=3
x+y-x+y=13+3
x+y=13
2y=16 /2
x+y=13
y=8
x=13-y
y=8
x=13-8
y+8
x=5
58
Odpowiedź: Szukana Liczba to 58