what should be add to 4pq-4q-6r to get 3pq+2q-12r
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Answer:
=> 3pq+2q-12r - (4pq-4q-6r)
=> 3pq+2q-12r-4pq+4q+6r
=> 3pq-4pq+2q+4q-12r+6r
=> -pq+6q-6r
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