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If three lines whose equations are y =m1...

If three lines whose equations are `y =m_1 x+c_1, y=m_2 x+c_2` and `y=m_3 x+c_3` are concurrent, then show that `m_1(c_2-c_3)+m_2(c_3-c_1)+m_3(c_1-c_2)=0`

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