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= 0,90 - 9/12 : 45/100 + 8/3
= 0,90 - 9/12 x 100/45 + 8/3
= 0,90 - 9/12 x 20/9 + 8/3
= 0,90 - 5/3 + 8/3
= 0,90 + 3/3
= 0,90 + 1
= 1,90 atau 19/10