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Start with the equation z = 1, then do any valid manipulation on the left side, and the same manipulation on the right side. The manipulations that won't change the solution set are: adding the same constant to both side; multiplying both sides by the same non-zero constant. Squaring and taking roots will sometimes add additional solutions, or eliminate solutions.

For example, and this is just an example of what you can do:

z = 1

Multiply both sides by 2:

2z = 2

Add 5 to both sides:

2z + 5 = 7

Add 1 to each side:

2z + 6 = 8

Multiply both sides by 2:

4z + 12 = 16

Add z to both sides:

5z + 12 = z + 16

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Q: What equations will give you the answer to z equals 1?
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