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5^{2x - 5} = (0,2)^{3x - 5}
5^{2x - 5} = (1/5}^{3x - 5}
5^{2x - 5} = 5^ -{3x - 5}
2x - 5 = - {3x - 5}
2x - 5 = - 3x + 5
2x + 3x = 5 + 5
5x = 10
x = 10/5 = 2
b)
(5/6)^x = 1,44 = 1 44/100 = 1 11/25 = 36/25
(5/6)^x = (5/6)⁻²
x = - 2