The solution to
15
a2 − 1
=
5
2a − 2
is

The solution is a=5

Step-by-step explanation: For this case the correct expression is:

 15 / (a ^ 2 - 1) = 5 / (2a - 2)

 Rewriting we have:

 3 / (a ^ 2 - 1) = 1/2 (a - 1)

 6 / (a ^ 2 - 1) = 1 / (a - 1)

 6 (a - 1) = (a ^ 2 - 1)

 6 (a - 1) = (a-1) (a + 1)

 (a + 1) = 6

 a = 6-1

a=5

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step-by-step explanation: