The expression we need to simplify is:
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Step 1. Use distributive property to multiply the number outside the parenthesis by the numbers inside the parenthesis. We get the following:

Step 2. Combine like variable terms.
We combine -30u and -12u, which results in -42u:
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Step 3. Combine like independent terms.
We combine the independent terms +6 and +36, which result in +42:

This answer corresponds to the letter Y of the options.
Answer:
Y: -42u+42