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2(10+x) = 42+x
20+2x = 42+x
2x-x = 42-20
x = 22 << za 22 lata ;)
42+x=2*(10+x)
42+x=20+2x
22=x
x=22 - musi upłynąć 22 lata. Sprawdzenie:
42+22=2*(10+22)
64=2*32
64=64
o-42
c=10
x-za ile lat
42+x=2(10+x)
42+x=20+2x
2x-x=42-20
x=22