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[" 7.A straight line through "A(-15-10)"...

[" 7.A straight line through "A(-15-10)" meets the lines "x-y-1=0,x+2y=5" and "],[x+3y=7" respectively at "A,B" and "C" .If "(12)/(AB)+(40)/(AC)=(52)/(AD)," prove that the line passes "],[" through the origin."]

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