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Verified answer
Cos (π/3 + 3x) = cos (-π/5)cos (π/3 + 3x) = cos (π/5)
cos (180/3 + 3x) = cos (180/5)
cos (60+3x) = cos (36)
60 + 3x = 36
3x = 36 - 60
x = -24/3 = -8°