Answer:
5
Step-by-step explanation:
The easiest way is to write this in the form of an exponent and then solve the exponent.
log base b of x=y is equivalent to b^y=x
For the given, this will be:
2^3 = 3x - 7
8 = 3x - 7
3x = 8+7
3x = 15
x = 5
Hope this helps :)