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Two sides of an isosceles triangle are given by the equation \( 7 x-y+3=0 \) and \( x+y-3=0 \). If its third side passes through the point \( (1,-10) \), then its equations are
(A) \( x-3 y-7=0 \quad \) or, \( 3 x+y-31=0 \)
(B) \( x-3 y-31=0 \) or, \( 3 x+y-7=0 \)
(C) \( x-3 y-31=0 \quad \) or, \( 3 x+y+7=0 \)
(D) none of these
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