x = 0
This is because 4 x 0 = 0 and 3 x 0 = 0. That leaves us with 5, and 5 = 5. Therefore x = 0
8x^4y^213. I personally cannot figure out the numerator and denominator, sorry :)
Recall that, an absolute value expression is a piece-wise in effect, thus we'd check the single-sided limits,