y is an unknown. For now, let's just call y an apple. 9+ apple +apple would be a 9 and 2 apples, right? So 9 plus y plus y is 9+ 2y. Without knowing the value of y, that is as far as you can go.
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3/Y+7\Y=9 =>Y=10\9
-15
Y+7=9 equals 2+7=9.
(9 - y)(a + 5)
(9 - y)(a + 5)