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Mathematics, 21.04.2020 19:54 faithrawlins14

Nigel makes the claim that x=6 is the solution to the equation 4(5xβˆ’12)βˆ’7x=5x. His work to support his claim follows.

Given: 4(5xβˆ’12)βˆ’7x=5x

Step 1: 20xβˆ’48βˆ’7x=5x

Step 2: 20xβˆ’7xβˆ’48=5x

Step 3: 13xβˆ’48=5x

Step 4: 13xβˆ’13xβˆ’48=5xβˆ’13x

Step 5: 0βˆ’48=βˆ’8x

Step 6: 6=x

Which of the following justifications can be used to justify and support Nigel's work?

Select all justifications that are correct.

Step 2 is justified by the Commutative Property.
Step 1 is justified by the Distributive Property.
Step 5 is justified by the Property of Additive Inverses.
Step 6 is justified by the Associative Property.
Step 4 is justified by the Symmetric Property.

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