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226÷[16+(42:a-15÷3):2]=15

Răspuns :

226÷[16+(42÷a-15÷3)÷2]=15
226÷[16+(42÷a-5)÷2]=15
[16×(42÷a-5)÷2]=226×15
16×(42÷a-5)÷2=3390
(42÷a-5)÷2=3,390÷16
(42÷a-5)÷2=211,875
(42÷a-5)=211,875×2
42÷a-5=423,650
a-5=423,650×42
a-5=177933
a=17.793 rest 3