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x + 2 = 2 * (x-8)
x + 2 = 2x - 16
18 = x
x = 18
----
sprawdzenie:
za dwa lata ---> 20
8 lat temu -----> 10
20 = 10 * 2
16-2=14
Julka ma 14 lat .
x+2=2x-16//+16
x+18=2x//-x
18=x