Let a x+b y+c=0 be a variable straight l...

Let `a x+b y+c=0` be a variable straight line, whre `a , ba n dc` are the 1st, 3rd, and 7th terms of an increasing AP, respectively. Then prove that the variable straight line always passes through a fixed point. Find that point.

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Let `a x+b y+c=0` be a variable straight line, whre `a , ba n dc` are the 1st, 3rd, and 7th terms of an increasing AP, respectively. Then prove that the variable straight line always passes through a fixed point. Find that point.

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