Answer :
we bring ecuation to the same denominator
16y -18=7y
16y-7y=18
9y=18
y=18/9=2
16y -18=7y
16y-7y=18
9y=18
y=18/9=2
According to the BODMAS rule, the question you had posted looks like this:
8y-9=(7/2)*y
8y-9=(7y/2)
16y-18=7y
16y-7y=18
9y=18
y=18/9
y=2