n z*d - 18*z + 16*d - 288*n
z*d - 18*z^n + 16*d - 288*n
n -288*n - 18*z + d*(16 + z)
-288*n - 18*z^n + d*(16 + z)
16.0*d - 18.0*z^n - 288.0*n + d*z