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13-4=-1-x
We move all terms to the left:
13-4-(-1-x)=0
We add all the numbers together, and all the variables
-(-1x-1)+13-4=0
We add all the numbers together, and all the variables
-(-1x-1)+9=0
We get rid of parentheses
1x+1+9=0
We add all the numbers together, and all the variables
x+10=0
We move all terms containing x to the left, all other terms to the right
x=-10
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