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C) 2x + y = 9
5x - 4y = 3

d) 3x - 2y = 5
2x - y = 4

e) 2x + 9y = -9
-3x + 3y = 8

f) 2x + 3y = 4
8x - 5y = -1

h) x-y = 0
x + y + z = 4
x + 2y + 3z = 9

Prosze całość rozwiązać, ewentualnie nie trzeba H, ale reszte tak. Pilne.
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