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A)-3a+6b-12c = -3(a-2b+4c) = -3 * 6 = -18
B)4b-2a-8c = -2a+4b-8c = -2(a-2b+4c) = -2 * 6 = -12
c)1/2a-b+2c-3 = 1/2(a-2b+4c)-3 = 1/2 * 6 - 3 = 3 - 3 = 0