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{[(3xA=5)x3+5]x3+5}x3+5=281

Răspuns :

{[(3a+5)*3+5]*3+5}*3+5=281
[(3a+5)*3+5]*3+5}*3=281-5
[(3a+5)*3+5]*3+5=276:3
[(3a+5)*3+5]*3=92-5
(3a+5)*3+5=87:3
(3a+5)*3=29-5
3a+5=24:3
3a=8-5
3a=3
a=3:3
a=1