An equation has solutions of m=-5 and m=9. what could be the equation?

The verbal translation for the difference of m and 7 increased by 15

Aline passes through 3,7 and 6,9 what equation represents the line

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?