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If f(x)=ax+b and g(x)=cx+d, then f(g(x))...

If f(x)=ax+b and g(x)=cx+d, then f(g(x))=g(f(x)) is equivalent to

A

`f(a)=g(c)`

B

`f(c)=g(a)`

C

`f(b)=g(b)`

D

`f(d)=g(b)`

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The correct Answer is:
D
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