find the sum with explanation
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___Sum of pq + 3qr - rp and 2pq + qr - 3rp___
= pq + 3qr - rp + 2pq + qr - 3rp
= 3pq + 4qr - 4rp
___Subtraction of 3pq + 4qr - 4rp from 11pq - 6qr + 10rp___
= ( 11pq - 6qr + 10rp ) - ( 3pq + 4qr - 4rp )
= 11pq - 6qr + 10rp - 3pq - 4qr + 4rp
= 7pq - 8qr + 14rp
= pq + 3qr - rp + 2pq + qr - 3rp
= 3pq + 4qr - 4rp
___Subtraction of 3pq + 4qr - 4rp from 11pq - 6qr + 10rp___
= ( 11pq - 6qr + 10rp ) - ( 3pq + 4qr - 4rp )
= 11pq - 6qr + 10rp - 3pq - 4qr + 4rp
= 7pq - 8qr + 14rp
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