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[" If the straight lines "x+y-2=0,2x-y+1=0," and "],[ax+by-c=0" are concurrent,then the family of lines "],[2ax+3by+c=0(a,b,c" are nonzero) is concurrent at "],[[" (a) "(2,3)," (b) "(1/2,1/3)],[" (c) "(-1/6,-5/9)," (d) "(2/3,-7/5)]]

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