3x+32+5x=-42 i dont know how to solve this

Start with                -3x + 32 + 5x  =  -42

This equation is messier than it needs to be.
Let's start by cleaning it up.
On the left side, add up the  -3x  and the  5x  to make  2x .
Then the equation looks neater.

                                      2x  +  32  =  -42

Now you can subtract
32  from each side:          2x           =  -74

Divide each side by 2:       x            =  -37  

Exponential function