It is 9y - 10. This is an expression which cannot be simplified and, since it is not an equation, it cannot be solved.
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(-y+4)+ (9y-6) (9y-y) + (4-6) 8y - 2
5y - 4 + 9y - 1y + 15= 5y + 9y - 1y + 15 - 4= (5 + 9 - 1)y + (15 - 4)= 13y + 9
(y - 7)(y - 2)
9y+3=5y+13 4y=10 y=10/4 or 5/2 or 2.5
(y - 2)(y - 7)