Let Y1 = 1 / 5x + 1, y2 = (2x + 1) / 4, when what is the value of X, Y1 and Y2 are opposite numbers to each other? (solved by a linear equation of one variable)

Let Y1 = 1 / 5x + 1, y2 = (2x + 1) / 4, when what is the value of X, Y1 and Y2 are opposite numbers to each other? (solved by a linear equation of one variable)

That is, Y1 + y2 = 0
So 1 / 5x + 1 + (2x + 1) / 4 = 0
Take 20 on both sides
4x+20+10x+5=0
14x=-25
x=-25/14