6*x + 4 + 10 + 8*x + x
6*x + 4 + 10 + 8*x + x при x = 1
6*(1) + 4 + 10 + 8*(1) + (1)
6 + 4 + 10 + 8 + 1
29
14 + 15*x
14.0 + 15.0*x