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= ( 3 i 4/18 + 4 i 15/18) * 9=
= 7 i 19/18 * 9=
= 8 i 1/18 * 9=
= 145/18 * 9 = (skracam ułamki)
= 145/2 * 1=
= 145/2=
= 72 i 1/2