Question

How do you solve `15q-17 = 13`?

Answer 1

Add `17` to both sides, then divide by `15`, to get `q=2`

Explanation:

Given
`color(white)("XXX")15q-17=13`

If we add `17` to both sides, the left side will be only a term with the factor `q` and the right side will be a constant (with no variable):
`color(white)("XXX")15q=30`

Now by dividing both sides by `15` we will be left with just `q` on the left side.
`color(white)("XXX")q=2`