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x + y = 5
3x = 6 | podzielić przez 3
x = 2 , więc y = 3
2. x - y = 1
2x + 2y = 10 | podzielić przez 2
x - y = 1
x + y = 5
2x = 6 | podzielić przez 2
x = 3, więc y = 2
3.