Because you have two denominators here in fractions, you need to find the LCD. In this case, it's 15 (3*5=15). Now multiply both sides by 15: . Now expand the equation and we get . Combining like terms we get , and then adding 3 to both sides yields . Finally, divide both sides by 80 and we get , which reduces to .
To check our work, substitute the value of x in the original equation, thusly: . Expanding gives us , which reduces to , which reduces still to . Because 3=3 is a true statement, that means our answer of is correct!