Subtract: 4 p^2+5 q^2-6 r^2+7 from 3 p^2-4 q^2-5 r^2-6 - Vidyadip

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Subtract:
$4 p^2+5 q^2-6 r^2+7$ from $3 p^2-4 q^2-5 r^2-6$

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