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-16a - 6b - 4a + 9b = -20a + 3b
2. -3(4k2l + 3kl2) + 2 (-9k2l - 4kl2)
-12k2l - 9kl2 - 18k2l - 8 kl2 = -30k2l - 17kl2
= - 20 a + 3 b