Answer:
x = - 1
Explanation:
using the rule of exponents
•
=

given
=
[ note that 8 = 2³ ]
=

=

since bases on both sides are the same, both 2 , then equate exponents
6x + 3 = 3x ( subtract 3x from both sides )
3x + 3 = 0 ( subtract 3 from both sides )
3x = - 3 ( divide both sides by 3 )
x = - 1