A (g1-g2)x+2(f1-f2)y+c1=0
B 2(g1-g2)x+2(f1-f2)y+c1=0
C 2(g1-g2)x+2(f1-f2)y+c1-c2=0
D 2(g1-g2)x+(f1-f2)y+c1=0
Correct Answer: Option C
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