subtract 7p (3q+7p) from 8p (2q-7q)
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7
16pq-56pq-21pq+49p^2
16pq-77pq+49^2
-61pq+49^2
ans. 49^2-61pq
16pq-77pq+49^2
-61pq+49^2
ans. 49^2-61pq
Answered by
6
(16pq-56pq)-(21pq+49p^)
-40pq-21pq-49p^
-61pq-49p^
-p(61q+49)
-40pq-21pq-49p^
-61pq-49p^
-p(61q+49)
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