Find for x: 8 times 7=x

What is the missing step in this proof ?

1: 4 if the wew 35 surfboards at the beach how many were short boards?

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.