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If the distance between planes , $\;4x - 2y -4z+1=0\;$ and $\;4x - 2y -4z+d=0\;$ is 7 , then d is :

$(a)\;41\;or\;-42 \qquad(b)\;42\;or\;-43\qquad(c)\;-41\;or\;43\qquad(d)\;-42\;or\;44$

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