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a.
h(n) = n
4n + 12 = n
12 = n - 4n
12 = - 3n
n = -4
b
h(2n) = 4n
4(2n) + 12 = 4n
8n + 12 = 4n
12 = 4n - 8n
12 = -4n
n = -3