3x+2+4x-20 what is the value of x

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?

What is the answer to question 11? richard simplified an expression in three steps, as shown taking 04.10 segment one exam part one (flvs)