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3x + 5 = 17
3x = 17 - 5
3x = 12 /:3
x=4
Odp. Piłka kosztowała 4zł
x + x + x + 5 = 17
3x + 5 = 17 | -5
3x = 12 | :3
x = 4
piłka kosztowała 4 zł