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y = 40 cm
x = ?
równanie soczewki:
1/f = 1/x + 1/y
1/f - 1/y = 1/x
1/x = 1/25 - 1/40 ; wspólny mianownik
1/x = 8/200 - 5/200
1/x = 3/200
x = 200/3
x = 66,67 cm