Plss answer only b
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Mark as brainliest plz
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b) 12ax + 6by + 11cz - 21ax - 15by + 6cz
= -9ax - 9by + 17cz
c) 16x^3 + 14x^2 - 9x + 15 - 17x^3 + 19x^2 - 13x + 21
= -x^3 + 34x^2 - 22x + 36
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