Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15).

I understand this so far

f(a)=f(a+15)

1/(7+a) + 15/(a-8) = 1/(a+22) + 15/(a+7)

I have multiplied the LCD of (a-8)(a+7)(a+22)by both sides with no luck.

This is a multiple choice question

a.) -161/8

b.) 120/7

c.) 161/7

d.) -17

I have the answer as

I understand this so far

f(a)=f(a+15)

1/(7+a) + 15/(a-8) = 1/(a+22) + 15/(a+7)

I have multiplied the LCD of (a-8)(a+7)(a+22)by both sides with no luck.

This is a multiple choice question

a.) -161/8

b.) 120/7

c.) 161/7

d.) -17

I have the answer as

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