x+y+z = 23320
x+y = 13746
y+z = 3660+13746
y+z = 17406
____________________
13746+ z = 23320
z= 23320-13746
*z= 9574*
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y+9574=17406
y=17406-9574
*y=7832*
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x+17406 = 23320
x=23320-17406
*x = 5914*
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Răspuns: x= 5914 ; y = 7832 ; z = 9574
Proba: 5914 + 7832 + 9574 = 23320 Adevărat