RovniceMnozinyBodu(JsouRovnobezne( n, p ), X )

A = (5.12, -5.88)
B = (12.24, -5.98)
C = (11.26, -2.62)
D = (8.14, -0.96)
f = Line(A, B)
g = Line(B, C)
h = Line(C, D)
i = Line(D, A)
X = (9.2, -3.88)
j = OrthogonalLine(X, f)
k = OrthogonalLine(X, g)
l = OrthogonalLine(X, h)
m = OrthogonalLine(X, i)
K = Intersect(f, j)
L = Intersect(g, k)
M = Intersect(h, l)
N = Intersect(i, m)
n = Line(N, K)
p = Line(M, L)
a = LocusEquation(AreParallel[n, p], X)