Помогите пожалуйста решить логарифмические уравнения

1)
$log_{5}((4 - 3x) \div 2) = log_{5}(25) \\ 2 - 1.5x = 25 \\ - 1.5x = 25 - 2 \\ - 1.5x = 23 \\ x = - 15.3$
2)
$log_{3}(5x) - log_{3}2 = 6 + 3 \\ log_{3}( \frac{5x}{2} ) = log_{3}2 \\ \frac{5x}{2} = 2 \\ 5x = 4 \\ x = 0.8$
3)
$log_{5}25 = 2 \\ log_{5}( \frac{4 - 3x}{2} ) = log_{5}(25) \\ \frac{4 - 3x}{2} = 25 \\ 4 - 3x = 50 \\ - 3x = 50 - 4 \\ - 3x = 46 \\ x = - 15.3$
4)
$log_{3}9 = 2 \\ 12 - 5x = 9 \\ - 5x = 9 - 12 \\ - 5x = - 3 \\ x = \frac{3}{5}$