Question

Twenty less than 8 times a number is the same as 15 more than the number

Answer 1

$x-\ number\\\\ 8x-20=15+x\ \ \ | subtract\ x\\\\ 7x-20=15\ \ \ | add\ 20\\\\ 7x=35\ \ \ | divide\ by\ 7\\\\ x=5\\\\Number\ is\ 5.$