Răspuns :
(a+29)-17= 17
a + 29 = 17 + 17
a + 29 = 34
a = 34 - 29
a = 5
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(5+29) -17 = 17
a + 29 = 17 + 17
a + 29 = 34
a = 34 - 29
a = 5
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(5+29) -17 = 17