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51 : 3 * 2= 34
17+34=51
2 liczba=2x
51=3x /3
17=x
17*2=34
liczby te to:34 i 17
y-druga liczba
x+y=51
x=2y
x+y=51/*(-1)
x-2y=0
-x-y=-51
x-2y=0
-x-y+-2y=-51
-3y=-51/:(-3)
y=17
x+y=51
x+17=51
x=51-17
x=34
licze na naj ;P