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Two sides of a triangle are (a + b) x + ...

Two sides of a triangle are `(a + b) x + (a-b)y-2ab = 0` and `(a-b)x + (a + b)y-2ab = 0`. If the triangle is isosceles and the third side passes through point `(b- a, a -b)`, then the equation of third side can be

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