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⁵/₇x=250 000
x=250 000:⁵/₇
x=cena domu
x=350 000zł
dom kosztował 350 000zł
2/7 + 3/7 = 250 000
5/7 × a = 250 000 | : 5/7
a = 250 000 × 7:5
a = 50 000 × 7
a = 350 000
Dom kosztował 350 000 zł.