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y-x=5
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| x+y = 27
| x-y= 5
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dalsze rozwiązanie :
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| x+y=27
| x=5+y
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| 5+y+y=27
| x=5+y
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| x=5+y
|2y=22
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| x = 5+11
|y=11
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|x=16
|y=11
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