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y- ilość jabłek po 5 zł
x+y=10
4x+5y=43
x=10-y
4(10-y)+5y=43
x=10-y
40-4y+5y=43
x=10-y
y=3
x=10-3=7
kupiono 3 kg jabłek po 5zł i 7 kg jabłek po 4zł