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(4/3+5/4-9/6) = 16/12 + 15/12 - 18/12 = 49/12
(2/3 +5/3 -15/3)= -8/3
(-9/10) / (7/4) = (-9*4) /(10*7) = -36/70
49/12 -8/3 - 36/70
=1715/420 - 1120/420 - 216/420
=379/420
Saludos........