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2014-06-14T19:02:53+03:00
A+7+a+8+a+9+a+10+a+11=990

5a+45=990

5a=990-45
5a=945
a=189

a+7=189+7=196
a+8=197
a+9=198
a+10=199
a+11=200

S=(196+296)*100/2=   492*50 =24600