Hey there! 
"8x = 25"
In order for you to solve for "x-value" (or the equation) we have to DIVIDE both of your sides by 8 
8x/8 = 25/8 
Cancel out: 8x/8 because that gives you the value of 1 and you don't need it at the moment (in that equation that is) 
Keep: 25/8 Because it solves for your equation
Your x equals: 25/8 aka 1 1/8 aka 3.125 (you could choose any one of these as your answer because they are all correct) 
Good luck on your assignment and enjoy your day! 
~LoveYourselfFirst:)