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The st. lines 3x + 4y =5 and 4x-3y = 15...

The st. lines `3x + 4y =5 and 4x-3y = 15` interrect at a point `A(3,-1)`. On these linepoints B and C are chosen so that `AB = AC`. Find the possible eqns of the line BC pass through the point `(1, 2)`

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