I hope this helps you
if B midpoint for AC than AB=BC=a
AB/AC=BF/CE
a/a+a =BF/90
a/2a=BF/90
1/2=BF/90
BF=90/2
BF=45
5x(x-3) = (x-2)(5x - 1) - 5
5x^2 - 15x = 5x^2 - x - 10x + 2 - 5
5x^2 - 15x = 5x^2 - 11x - 3
5x^2 - 11x - 3 - 5x^2 + 15x = 0
4x - 3 = 0
4x = 3
x = 3/4 or 0.75
