Suppose that a/7 = b/5, what is the value of 5a+7b/a?

Question

I dont understand the quest

Answer 1

5a + 7b/a does not have a specific value, since a and b do not have specific values

It can be expressed in terms of one variable, e.g.,

a/7 = b/5

5a/7 = b

then

7b/a = 7(5a/7) / a

7b/a = 5a/a

7b/a = 5

5a + 7b/a = 5a + 5