3^( 2x - 1 ) - 3^2x + 3^( 2x + 3 ) = 237
3^2x * ( ( 1/3 ) - 1 + 27 ) = 237
3^2x = 237 : 26 1/3
3^2x = 237 : 79/3
3^2x = 9
3^2x = 3^2
2x = 2
x = 1
-----------------------------
5^( 2x - 30 ) - 30*5^( x + 125 ) = 0
5^( 2x - 30 ) = 30*5^( x + 125 )
5 ^ ( 2x - 30 ) : 5 ^ ( x + 125 ) = 30
5 ^ ( 2x - 30 - x - 125 ) = 30
5 ^ ( x - 155 ) = 30
x - 155 = log₅ 30
x = ( log ₅ 30 ) + 155
--------------------------------------------------
( 1/36 ) ^ - 10√x = 2^5x * 3^ 5x
( 6 ^ - 2 ) ^ - 10√x = 6 ^ 5x
6 ^ 20√x = 6 ^ 5x
20√x = 5x
√x = a
20a = 5a^2
20a - 5a^2 = 0
5a( 4 - a ) = 0
5a = 0 ==> a = 0
4 - a = 0 ==> a = 4
√ x = 0 ==> x = 0
√ x = 4 ; x = 16