Rozwiąż układ:
3p - 3g = 21
p - g = 7
-3p-3g=-21
-6g=0
g=0
3p=21
p=7
_
| 3p - 3g = 21
|_ p - g = 7
|_p = 7 + g
| 3 x ( 7 + g ) - 3g = 21
| 21 + 3g - 3g = 21
| 0g = 0
|_ p = 7 + 0
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3p - 3g = 21
p - g = 7
3p - 3g = 21
-3p-3g=-21
-6g=0
g=0
3p=21
p=7
_
| 3p - 3g = 21
|_ p - g = 7
_
| 3p - 3g = 21
|_p = 7 + g
_
| 3 x ( 7 + g ) - 3g = 21
|_p = 7 + g
_
| 21 + 3g - 3g = 21
|_p = 7 + g
_
| 0g = 0
|_ p = 7 + 0