(-1994)*(1995/1996)*{62/7+(-62/7)}*(-1996/1999)

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(-1994)*(1995/1996)*{62/7+(-62/7)}*(-1996/1999)(-1994)*(1995/1996)*{62/7+(-62/7)}*(-1996/1999)(-1994

(-1994)*(1995/1996)*{62/7+(-62/7)}*(-1996/1999)
(-1994)*(1995/1996)*{62/7+(-62/7)}*(-1996/1999)

(-1994)*(1995/1996)*{62/7+(-62/7)}*(-1996/1999)
62/7+(-62/7)=0
(-1994)*(1995/1996)*{62/7+(-62/7)}*(-1996/1999)=0