verify that (x÷y)÷z=x÷(y÷z) by taking x=-1/2,y=3/5,z=-7/11
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(1/2÷3/5 )÷_7/11=1/2 ÷(3/5÷ -7/11)
(1/2×5/3)÷ -7/11=1/2÷ (3/5× 11/-7)
5/6×11/-7=2/1 (33/-35)
55/-42=66/-35
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