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-2x=-2x

 Nov 28, 2018
 #1
avatar+28 
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from this equation, you can get x = x, and then 0 = 0, which means that x can be everything.blush 

 Nov 28, 2018
edited by otaku  Nov 28, 2018
 #2
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-2x = -2x simplifies to 0 = 0, which is always true. (The two -2x cancel out each other). You also have a reflexive property statement. 

 Nov 28, 2018

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