Answer:
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Explanation:
Topic- Algebra
Subtract 6 from z will be rewritten as,

On this algebraic expression, There is one term and a number.We can't simplify it.(If we could Simplify the given expression then also we can't as there is a condition)
Then , We have asked to multiply the result (z-6) by 3.
That is,

But,the condition is that we should not simplify any part of the given expression.So we can't simplify this expression.
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I hope this helps!
Please let me know if you have any questions.I am joyous to help!