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a fost răspuns

{21-[17-(2×a+1):3]÷2+2×3}×2-17=23

Răspuns :

{21-[17-(2×a+1):3]:2+2×3}×2-17=23
[4-(17-2×a+1:3):8]×2-17=23
[4-(15×a+1:3):8]×2-17=23
[4-(15a+15:3):8]×2-17=23
[4-(15a+5):8]×2-17=23
15a=4+5×8×2-17+23
15a=9×8×2-40
15a=72×2-40
15a=144-40
15a=104
a=104:15
a=6 r 14