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2014-09-17T21:49:29+03:00
{18-[(2*a-8):3-5];3+12}:9=3
{18-[(2*a-8);3-5]:3+12=27
{18-[(2*a-8):3-5]:3=15
18-(2*a-8):3-5=45
18-(2*a-8):3=40
-(2*a-8)=22
2*a-8=-22
2*a=-14
a=-14:2
a=-7
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