subtract ( 6p² - 13pq +r) from (- 12p² + 15pq - 14r)
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(-12p² + 15pq - 14r) - ( 6p² - 13pq + r)
= -12p² + 15pq - 14r - 6p² + 13pq - r
= -18p² + 28pq - 15r
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