#### Answer

{ all real numbers}

#### Work Step by Step

First, we apply the distributive property in order to remove the parenthesis in the equation:
$-5(n+1)-(n-2)=3(-2n-1)$
$-5n-5-n+2=-6n-3$
To solve this equation, we will first collect the variable and the constants on the opposite sides of the equality sign. Then, we will perform arithmetic operations on the resultant equation:
$-5n-n+6n=-3-2+5$
$-6n+6n=-5+5$
$0=0$
Therefore, the solution set is {all real numbers}.