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x-7=-7-x
We move all terms to the left:
x-7-(-7-x)=0
We add all the numbers together, and all the variables
x-(-1x-7)-7=0
We get rid of parentheses
x+1x+7-7=0
We add all the numbers together, and all the variables
2x=0
x=0/2
x=0
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