Find the sum of the following expressions: \[ p v^{2}-9 q \nu+7 r ;-2 p y^{2}+3 q y-6 r ; 7 q y-...

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Find the sum of the following expressions:
\[
p v^{2}-9 q \nu+7 r ;-2 p y^{2}+3 q y-6 r ; 7 q y-4 r ; 3 p y^{2} .
\]
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