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y - cena stolu
4x + y = 1003.9
2x + y = 711.96
y = 711.96 - 2x
4x + 711.96 -2x = 1003.9
2x = 291.94
x = 145.97
y = 711.96 - 2*145.97
Y = 420.02
Odp: stol kosztuje 429.02 zl a fotel 145.97