a ) 3 ^ x = 3 ^ 7
x = 7
b ) 2 ^ ( x + 3 ) = 4 ^ 3
2 ^ ( x + 3 ) = 2 ^ 6
x + 3 = 6
x = 6 - 3
x = 3
c ) 5 ^ ( 3 x - 1 ) = 5 ^ 5
3 x - 1 = 5
3 x = 5 + 1
3 x = 6
x = 6 : 3
x = 2
d ) 2 ^ ( x + 3 ) = 4 ^ 3
2 ^ ( x + 3 ) = 2 ^ 6
x + 3 = 6
x = 6 - 3
x = 3
e ) 3 ^ ( 2 x - 1 ) = 27 ^ 3
3 ^ ( 2 x - 1 ) = 3 ^ 9
2 x - 1 = 9
2 x = 9 + 1
2 x = 10
x = 10 : 2
x = 5
f ) 3 ^ x × 3 ^ 5 = 3 ^ 10
3 ^ ( x + 5 ) = 3 ^ 10
x + 5 = 10
x = 10 - 5
x = 5