3 1/7 * 3/11 + 3/8 : 7/12 = 1,5
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1) 22/7 * 3/11 = 6/7
2) 3/8 : 7/12 = 36/56 = 9/14
3) 6/7 + 9/14 = ( 12 + 9)/ 14 = 21/14 = 3/2 = 1,5
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X - 6 8/9 = 1 1/6
X = 1 1/6 + 6 8/9 = 1 3/18 + 6 16/18 = 7 19/18 = 8 1/18