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(5^x)^2 + 5(5^x) - 6 = 0
(5^x + 6)(5^x - 1) = 0
5^x + 6 = 0 -----> tidak ada x yg real yg memenuhi
5^x - 1 = 0 -----> x = 1/5
jadi, solusi untuk x = 1/5