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2014-10-16T15:13:12+03:00
Ab-ac=135
a(b-c)=135
9*(b-c)=135
b-c = 135:9+
b-c = 15
1 5 1
2014-10-16T15:14:13+03:00
Dam factor comun. A(b-c)=135 9(B-c)=135 B-c=135:9 B-c=15