Let \( a \) and \( b \) be the roots of the equation \( x^{2}-10 c x-11 d=0 \) and those of \( x...

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Let \( a \) and \( b \) be the roots of the equation \( x^{2}-10 c x-11 d=0 \) and those of \( x^{2}-10 a x-11 b=0 \) be \( c, d \). Then the value of \( a+b+c+d \), when \( a \neq b \neq c \neq d \), is
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