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2x = 10
x = 5
2 ( 10 + y) = 40 + y
y = 20
musi uplynac 5 lat aby byl 3 razy starszy
musi uplynac 20 lat aby ojciec byl razy starszy
syn 10 lat
40+x=3(10+x)
40+x=30+3x
2x=10 /:2
x=5
Odp. za 5 latkuff=]=]
buziam