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wstawiasz do drugiego:
(12-x)^2 = x^2 +25
144 - 2*12*x + x^2 = x^2 + 25
-24x = 25-144
-24x = -119
x = 119/24 = 4 i 23/24
wracasz do pierwszego: R = 12 - 4 i 23/24 = 7 i 1/24