full explanation please
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Step-by-step explanation:
-(x+y)=(-x)+(-y)
-(3/4+6/7)=(-3/4)+(-6/7)
-(3/4+6/7)=(-3/4)-6/7
-(21+24/28)= -21-24/28
-(45/28)= -45/28
-45/28= -45/28
LHS = RHS
Hence verified
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