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5(n+2) - (-12) : 4 = 28
5n + 10 + 12 : 4 = 28
5n + 10 + 3 = 28
5n + 13 = 28
5n = 28-13
5n = 15
n = 15/5
n = 3

4^n
= 4^3
= 64