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13+{4×[28+(a+2):6]-5}:5=36
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Răspuns :

13+{4×[28+(a+2):6]-5}:5=36
{4×[28+(a+2):6]-5}:5=36-13
{4×[28+(a+2):6]-5}:5=23
{4×[28+(a+2):6]-5} = 23×5
4×[28+(a+2):6]-5 = 115
4×[28+(a+2):6] = 115+5
4×[28+(a+2):6] = 120
[28+(a+2):6] = 120:4
28+(a+2):6 = 30
(a+2):6 = 30-28
(a+2):6 = 2
a+2 = 2×6
a+2 = 12
a = 12-2
a = 10