4 * 7 ^ ( 2x + 4 ) - 3 ^ ( 2x + 6 ) - 2 * 7 ^ ( 2x + 3 ) + 3 ^ ( 2x + 3 ) = 0
4 * 7 ^ ( 2x + 4 ) - 2 * 7 ^ ( 2x + 3 ) = 3 ^ ( 2x + 6 ) - 3 ^ ( 2x + 3 )
7 ^ ( 2x + 3 ) * ( 4 * 7 - 2 ) = 3 ^ ( 2x + 3 ) * ( 3 ^ 3 - 1 )
7 ^ ( 2x + 3 ) : 3 ^ ( 2x + 3 ) = 26 : 26
( 7/3 ) ^ ( 2x + 3 ) = 1
( 7/3 ) ^ ( 2x + 3 ) = ( 7/3 ) ^ 0
2x + 3 = 0
2x = - 3
x = - 1,5