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y - kalkulator
3x + 20y = 16000
x = 20y
3 * 20y + 20y = 16000
60y + 20y = 16000
80y = 16000 ||:80
y = 200 [zł]
x = 20 * 200
x = 4 000 [zł]
x - komputer
y - kalkulator
3x + 20y = 16000
x = 20y
3 * 20y + 20y = 16000
60y + 20y = 16000
80y = 16000 ||:80
y = 200 zł
x = 20 * 200
x = 4 000 zł