I don’t know which one it is I dint get it?

How do you use the elimination method for this question? explain, because i really want to understand!

Solve the equation - 2(m -30) = -6m a-15 b-13 c-8 d8

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.