please say my answer I will gave you to thanks
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according to question. let the required no be x
(-4/7)^-1 ÷ x =. (-8/7)^-1
= (-7/4)÷x = (-7/8)
= (-7/4) × 1/x = (-7/8)
°= 1/x= (-7/8) ÷ (-7/4 )
1/x =( -7/8) ×(-4/7)
1/x= 1/2
hence x= 2
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