Can you solve it?

It's hump day and while your mind might be looking towards the weekend, plenty of people have had their brains absolutely melted over the latest viral riddle to take the internet by storm. Horses, horseshoes, riding boots and a little bit of algebra shouldn't be the hardest thing in the world to solve, right? If you think that you've got the brain power to get the correct answer then give it a go. Ok, you've probably got an answer. Are you 100% certain of it? Is it 48? Ok, here's the correct answer. https://twitter.com/PrincetonBrooke/status/773454959589330944 21! Twenty-fu**ing-one. How did this happen you ask? To begin with, did you pay attention to the fact that the final equation has a singular boot, horse and horseshoe? Ok, you did. Cool. How familiar are you though with a mathematical term that's called the order of operations?  How about the abbreviation "PEMDAS", which is turned into the phrase "Please Excuse My Dear Aunt Sally". It stands for "Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction". Essentially, this rule means that multiplication will always take precedence over addition in any equation. Yep, we forgot about that one also.. Here's an explanation for of the whole thing if you still have any doubts. https://www.youtube.com/watch?v=3QMoJVHutw8 Article via JOE.ie