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45-2×{17+14:[27-(15+a)]-3}=3
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Răspuns :

45-2×{17+14:[27-(15+a)]-3}=3
45-2(17+14:(12-a)-3)=3
45-2(14+14/12-x)=3
45-2(14+14/12-x)=3
45-28-28/12-x=3
17-28/12-x=3
-28/12-x=3-17
-28=-14(12-x)
2=12-x
x=12-2
x=10