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If the lines whose equations are y=m1 x+...

If the lines whose equations are `y=m_1 x+ c_1 , y = m_2 x + c_2 and y=m_3 x + c_3 ` meet in a point, then prove that : `m_1 (c_2 - c_3) + m_2 (c_3 - c_1) + m_3 (c_1 - c_2) =0`

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