I think what you might have meant was LCD (Lowest Common Denominator)
The LCD for 11/7 and 3/8 is 56
Making equivalent fractions using the LCD:
11/7 becomes 88/56
3/8 becomes 21/56
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7/8 ÷ 11/16 = 7/8 × 16/11 = 14/11 = 1 3/11
6/11 + 3/7... 6/11 = 42/77 & 3/7 = 33/77 42/77 + 33/77 = 75/77
7/11 cannot be simplified further.
7/12 - 11/12 = -4/12 which simplifies to the final answer of negative 1/3
=154/231 =7(22)/7(33) =11(2)/11(3) =2/3