((5/7:2/3*9/30):(9/14*1/6))*1 1/3=(1/7*3/2*9/6):(3/14*1/2)*1 1/3=(1/7*1/2*9/2):3/28*1 1/3=9/28:3/28*1 1/3=9/28*28/3*1 1/3=3*4/3=4
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((5/7:2/3*9/30):(9/14*1/6))*1 1/3=(1/7*3/2*9/6):(3/14*1/2)*1 1/3=(1/7*1/2*9/2):3/28*1 1/3=9/28:3/28*1 1/3=9/28*28/3*1 1/3=3*4/3=4