In the following cases, you need to change the sign to solve the inequality:

1, both sides of the inequality are multiplied or divided by a negative number;

2. The reciprocal of the inequality with the same sign (that is, positive or negative) needs to be changed.

Because -5m-3=-(5m+3)

therefore

-5m-3 & gt； 0

-(5m+3) > divide both sides of 0 by-1

5m+3 & lt； 0

m & lt-3/5