Odpowiedzi

2009-03-25T17:34:37+01:00
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2x-2y=7
4x+3y=21
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2x=7+2y
(7+2y)*2+3y=21
14+4y+3y=21
7y=21-14
7y=7
y=1
x=4,5

4 5 4