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2. (8a²-6a-5) + (4a²+7a+9) = 12a²+a+4 (A)
3. -5 (3p+q) - (2p-3q) = -15p - 5q - 2p +3q = -17p - 2q (B)
4. (-p pangkat 6 q pangkat 4 r²) : (-p³q²r) = (p pangkat 6-3) (q pangkat 4-2) (r pangkat 2-1) = p³q²r (D)
5. -2(4a²b³)³ = -2(64a pangkat 6 b pangkat 9) = -128 a pangkat 6 b pangkat 9 (A)