-5/21
Step-by-step explanation:
-3/7 & -4/6
common detonator is 42
-3/7 = -18/42 reduced to -9/21
-4/6 = -28/42 reduced to -14/21
difference between -9/21 and -14/21 = -5/21
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step-by-step explanation:
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765238725478629038640962136509762139056074
64087235609746097215074621039754021037