10*x + 23*x - 20*x - 19*x
10*x + 23*x - 20*x - 19*x при x = 1/3
10*(1/3) + 23*(1/3) - 20*(1/3) - 19*(1/3)
10/3 + 23/3 - 20/3 - 19/3
-2
-6*x
-6.0*x
33*x - 19*x - 20*x