Factorise -
-12pq^2r+28pq^2r+8pr^2

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Solution

-12pq^2r + 28pq^2r + 8pr^2
= (-12pq^2r + 28pq^2r) + 8pr^2
= 16pq^2r + 8pr^2
= 8pr (2q^2 + r)

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