f(x) = 2.0 * x + abs(x - 1.0)
A = (1, 2)
b = 1.7 (slider from 1 to 3, step 0.1)
c = 0.6 (slider from 0 to 1, step 0.1)
E: (b, f(b))
B: (c, f(c))
d = OrthogonalLine(B, xAxis)
e = OrthogonalLine(E, xAxis)
C = Intersect(d, xAxis)
F = Intersect(e, xAxis)