Math help with properties?

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Why is  the same as  4x + 21=18? What property was used to rewrite

 

Apr 7th, 2015

4x+21 =18

Transposing 21 to the other side

4x = 18-21

4x = -3

Dividing by 4 on both sides

x = -3/4

Apr 7th, 2015

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Apr 7th, 2015
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Apr 7th, 2015
Aug 16th, 2017
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