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22 October, 06:29

What is the justification for the step taken from line 2 to line 3?

3x+9-7x=X+10+X

4x+9=2x+10

6x+9 = 10

6x=1

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Answers (1)
  1. 22 October, 08:22
    0
    4x was added to 2x because they are the same (properties?)
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