Find `f(g(x))` and its domain

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter9: Quadratic Functions And Equations
Section9.9: Combining Functions
Problem 51HP
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Find `f(g(x))` and its domain if `f(x)=` `(-7x)/(-x+6)` and `g(x)=` `-8/(-2x-6)`.

a. `f(g(x))=` __________________      Simplify this answer completely.

b. Domain of `f(g(x)) = {x|x!= `__________________   `} `    List all values excluded from the domain.

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