If $a @ b$ is defined as $a @ b$ = $3a - 3b$, what is the value of $3 @ 5$?
Question:
If $a @ b$ is defined as $a @ b$ = $3a - 3b$, what is the value of $3 @ 5$?
Answer:
Let's think step by step.

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If $a @ b$ is defined as $a @ b$ = $3a - 3b$, what is the value of $3 @ 5$?
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