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