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√3^(5x+1) = 81 : (1/3)4
3^(5x+1) = 6.561²
3^(5x+1) = 3^8(2)
5x +1 = 16
5x = 15
x= 3
3⁻⁴ . 3^((5x + 1)/2) = 3⁴
3^(((5x + 1)/2)+(-4)) = 3⁴
(5x + 1)/2 - 4 = 4
5x + 1 - 8 / 2 = 4
5x + 1 - 8 = 8
5x - 7 = 8
5x = 8 + 7
5x = 15
x = 15 / 5
x = 3