Answer :

dln
"Twenty less than 8 times a number"
[tex]8x-20[/tex]

"15 more than the number"
[tex]x+15[/tex]

It says they are the same, so you set them equal to eachother.
[tex]8x-20=x+15 \\ 8x=x+35 \\ 7x=35 \\ x=5[/tex]
x = 5
hope this helps!!!!!!!!!!!!!!