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pusty pojemnik waży:135g-2×60g=135-120=15g
75-60=15
15g waży pusty pojemnik
40x+y=135
20x+y=75
y=135-40x
20x+y=75
20x+y+135-40x=75
-20x=-60/ (-20)
x=3
40*3+y=135
y=135-120
y=15
Pojemnik waży 15 g :p