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4+2r (4+2r)q 2/25 geo
2/25= (4+2r)q^2
Z= 24-x-y
4+2r (24-(4+r+4+2r) 2/25 geo
(4+2r) 16-3r 2/25 geo
(16-3r)/(4+2r) = 2/25/(16-3r)
Jedna niewiadoma z tego wyliczysz r.