Saw Variable

How can I solve for a given variable on this type of equation?
Hello, recently on my math textbook, I saw a problem like this that is going to be on a test:
a = b + b*c*d where you have to solve for b.
I’ve tried it but can’t seem to get a right answer.
Thank you very much.
Factor b out of both terms on the right-hand side of the equation:
a = b(1 + c*d)
Then divide both sides by “1 + c*d” to isolate b:
a/(1 + c*d) = b
Reverse it, if you like, so that the variable you solved for is on the left-hand side:
b = a/(1 + c*d)
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