The "study" equation.

study = no fail -----> equation "1"

no study = fail -----> equation "2"

"1" + "2" :

no study + study = no fail + fail

(factorize)

(no + 1) study = (no + 1) fail

(no + 1) study  =  (no + 1) fail

FINAL ANSWER :

Study = Fail

Better sleep.