3p(5q-3r+5p)-4p(p-4q+5r) please solve it till end.
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3p(5q-3r+5p)-4p(p-4p+5r)
15pq-9pr+15p^2- 4p^2+16p^2-20pr
15pq -9pr-20pr +15p^2-4p^2+16p^2
15pq - 11pr + 27p^2
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