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2014-10-07T16:14:34+03:00
{13+[25x4-(3x11+3x22)]xm}:2=13
{13+[100-(33+66)]xm}:2=13
{13+[100-99]xm}:2=13
{13+m}:2=13
13+m=26
m=26-13
m=13
2 5 2