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If there was a question it is not clear. I will show you what commutativity works. Whether that answers your lack of question remains to be seen.
Commutativity of multiplication (or the commutative property of multiplication) means that the order of the factors in a product does not affect the result. In other word, the order of factors is unimportant.
With algebra you are learning problem solving-that is the process of problem solving using rules and equations. The best way to learn it is to shut out all distraction and work at it. If there is something you don't understand you may have to go back to the beginning and learn all the principals and rules that you don't understand- Algebra can be a very hard subject but it can be concord with persistence.
How does the bulb look? Is it bright or kind of dim. The bulb warming error is designed to halt use of the machine until the scanner bulb reaches the correct output level. As these are basically a flourescent tube, they will dim over time and at a certain point they will not generate enough light to enable proper scanning. If the bulb is dim, it will require replacement.