Why Josh Graham failed

Well today was most certainly interesting most especially in maths. I had alot of fun horsing around with my best friend Josh Graham an awesome guy. But allas everyone fails at some point and today we were teasing Josh about his failure in maths not that hes not good at it. Its just he beats me in alot of tests and we decided to tease him today. Well their could be alot of reasons Josh failed and obviously alot of them are to complex to go into right now so lets start with reason one he could have failed:
1) He failed to compensate for his fractions and put them in decimal form but sadly this is not the reason he failed
2) He could have decided to put the wrong number in the equation but again this is sadly why he did not fail
3) He put his Brackets in the wrong places and therefore did not times the number out front into the brackets this although very likely is not why Josh Graham failed
4) I could go into many more reasons why Josh Graham failed today and a long description of each one that could be included but that would take up an entire book infact three as he failed 3 times in one lesson.

The true reason Josh failed was he forgot to put in a miniscule little minus..... the minus thats suppose to change the equation entirely LOL who thought a minus could change the equation into something wrong.