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20x+30y=830
x=33-y
20*(33-y)+30y=830
660-20y+30y=830
10y=170 /10
y=17
x=33-17
x=16
y-ilość wagonów o ładowności 30t
{20x+30y=830
{x+y=33|*(-20)
{20x+30y=830
+{-20x-20y=-660
-------------------
10y=170|:10
y=17
{y=17
{x+y=33
{y=17
{x=33-17
{y=17
{x=16