2.6 - 1.75 = 0.85
or
13/5 = 52/20
7/4 = 35/20
52 - 35 = 17/20 = 0.85
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Six twelves is 72. 72 minus three fourths is 71 and one fourth. If you meant six twelfths minus three fourths, the answer is minus one fourth.
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
three fifths plus one quarter = 17 twentieths
six and three fifths
Eight and three fourths minus by two and one fourth equals six and one fourths (6.5).