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2014-06-15T12:04:04+03:00
180-140:a=170
180-170=140:a
10=140:a
a=140:10=14
1 5 1
2014-06-15T12:04:57+03:00
36•5-(140:a)=157+13=> 180-(140:a)=170 => -(140:a)=-170-180=> -(140:a)=-10 (•-1) => 140:a=10 => a=14