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y - masa piłeczki
x + 0,9 = y |*-20
2x = y + 0,7 |*10
-20x - 18 = -20y
20x = 10y +7
-20x + 20y = 18
20x - 10y= 7
10y = 25
y=2,5
20x - 25 = 7
20x = 32
x = 1,6
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