17-8-3[7+ (18-12) + 31-5+3)= 20 + {4 [3-2 + (15 -4)- (16-7) +8]} =
{[(50 +8) - 10 + (19-7] + 6] - 12}=
(32 +14). [28 +65) :3. (52.23]]ĺ​