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y-cena biletu normalnego
3x+2y=30/*2
2x+3y=32,5
6x+4y=60
2x=32,5-3y
3(32,5-3y)+4y=60
2x=32,5-3y
97,5-9y+4y=60
2x=32,5-3y
-5y=-37,5/:(-5)
2x=32,5-3y
y=7,5
2x=32,5-22,5
y=7,5
2x=10
x=5
y=7,5