find x if 9 (x) =0 ; where 9 (x) =5x-6/7
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Let f(x)=y=
7x+9
5x+6
7xy+9y=5x+6
⇒x(7y−5)=6−9y
x=
−7y+5
9y−6
x=f
−1
(y)=
−7y+5
9y−6
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