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3x -5y=-24/*5
-15x + 9y = 72
15x - 25y = -120
-16y = -48 / : (-16)
y=3
i teraz podstawiam pod dowolne równanie
3x - 5 * 3=-24
3x- 15=-24
3x=-24+15
3x=-9/:3
x =-3