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b. k(2 - 1) - -b(5 - 1)
c. yang ini sorry, aku gk bisa :)
b. 2k - k - 5b -b = k - 4b
c. 4x - 4 + 6x - 6 - 2x = 4x + 6x - 2x - 4 - 6 = 8x - 10 (begini ? maaf kalo salah , soalnya kurang jelas)