Question 141447
The question really is where can that statement be true?

b(5b-3)=0

Recall that if we multiply two numbers together, in order to get zero one must be zero!

so b=0
or 5b-3=0

Now, solve the second equation:
5b=3
b=3/5

This gives you a solution set of b=0 or b=3/5.