First you would make simplyfiy the expression so that you would have x on one side, when you do that you will get 28x=4. When simplyfied you will get 1/7.
For this case we have the following equation: Rewriting we have: We raise both members of the equation to the square: Rewriting we have: It's a extraneous solution because equality is not met by substituting x = 10 in the original equation: Answer: The solution is: It's a extraneous solution