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(-x)=x
We move all terms to the left:
(-x)-(x)=0
We add all the numbers together, and all the variables
(-1x)-x=0
We add all the numbers together, and all the variables
-1x+(-1x)=0
We get rid of parentheses
-1x-1x=0
We add all the numbers together, and all the variables
-2x=0
x=0/-2
x=0
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