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eksponen
25^(x² – 5x + 7) = (1/25)^(x – x² – 15)
25^(x² – 5x + 7) = 25^-(x – x² – 15)
lihat pangkat nya
x² – 5x + 7 = -x + x² + 15
-5x + x = 15 – 7
-4x = 8
x = 8/-4
x = -2