First, you need to combine like terms which will make the equation x-5=x-14 and then cancel out x making the equation -5=-14 which is not true meaning there is no solution
LCM the last common multiple. the greatest common factor is the biggest number that will go into the 2 numbers so it can be no bigger than the 2 numbers. the LCM is larger than at least one of them
in the denominator is missing in the second expression. It should be
