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20000 - 15000 = 5000 - tyle po 20 zl
Razem uzyskano 20000 zł. :)
y- bilety za 20 zł
x+y = 1500 /*(-10)
10x + 20y = 20000
-10x - 10y = - 15000
10x + 20y = 20000
10y = 5000 / :10
y= 500
spr. x= 1500 - 500
x= 1000