Given that Y1 = 1 / 5x + 1, y2 = (2x + 1) / 4, when what is the value of X, Y1 and Y2 are opposite to each other?

Given that Y1 = 1 / 5x + 1, y2 = (2x + 1) / 4, when what is the value of X, Y1 and Y2 are opposite to each other?

-25/24