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-x-15=-15-x
We move all terms to the left:
-x-15-(-15-x)=0
We add all the numbers together, and all the variables
-x-(-1x-15)-15=0
We add all the numbers together, and all the variables
-1x-(-1x-15)-15=0
We get rid of parentheses
-1x+1x+15-15=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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