Please don't edit/change your question after it has been answered.... post another Q if you have a different one...
50 * x = 4500 divide both sides by 50
x = 4500/50
x = 90
I answered a similar question, not the one asked. (Although the question has been changed to another similar question)
I answered like this because I did not believe the answer to the exact question would be the best way to help this student to learn.
He/she obviously lacks a primary school, pre-algebra, concept. So I did not want to use algebra to answer.