Three twelves is 36. Four twelves is 48. 36 - 48 = -12.
Three twelfths - fourth twelfths equals minus one twelfth.
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(4*12) minus (9*12) = -60
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.
Three twelves
5/12 or (9 x 12) - (4 x 12) = (5 x 12) = 60 Nine of anything minus four of the same thing is always five of them.
5/6 minus 3/12 is 7/12