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^ tanda pangkat5^(x²+6x-42) = (5^5)^(12-x)
5^(x²+6x-42) = 5^5(12-x)
x² + 6x - 42 = 5(12 - x)
x² + 6x - 42 = 60 - 5x
x² + 6x + 5x - 42 - 60 = 0
x² + 11x - 102 = 0
(x + 17)(x - 6) = 0
x = -17 atau x = 6