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zad.1
x- pustaki
y -cegły
3x + 10 y =5x + 4y | - 3x
10y = 2x + 4y | - 4y
6y = 2x
2 pustaki ważą tyle samo co 6 cegieł
zad.2
7x - 4 = x + 20
6x = 24 /: 6
x = 4