Let $p(x) = 2x - 7$ and $q(x) = 3x - b$.  If $p(q(4)) = 7$, what is $b$?
Question:
Let $p(x) = 2x - 7$ and $q(x) = 3x - b$.  If $p(q(4)) = 7$, what is $b$?
Answer:
Let's think step by step.

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Let $p(x) = 2x - 7$ and $q(x) = 3x - b$.  If $p(q(4)) = 7$, what is $b$?
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