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2a+5<0 a+1<0
For the quotient to be positive, 2a+5 and a+1 have to be both negative or both positive. Consider the case when 2a+5 and a+1 are both negative.
a<-\frac{5}{2}
The solution satisfying both inequalities is a<-\frac{5}{2}.
a+1>0 2a+5>0
Consider the case when 2a+5 and a+1 are both positive.
a>-1
The solution satisfying both inequalities is a>-1.
a<-\frac{5}{2}\text{; }a>-1
The final solution is the union of the obtained solutions.