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5L+3P=9800
5L+3P-(2L+3P)=9800-7250
5L+3P-2L-3P=2550
3L=2550
L=2550:3
L=850-tyle kosztuje lodówka
5L+3P=9800
5*850+3P=9800
4250+3P=9800
3P=9800-4250
3P=5550
P=5550:3
P=1850-tyle kosztuje pralka
Odp. Lodówka kosztuje 850 zł., a pralka 1850 zł.