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13=-x-10
We move all terms to the left:
13-(-x-10)=0
We add all the numbers together, and all the variables
-(-1x-10)+13=0
We get rid of parentheses
1x+10+13=0
We add all the numbers together, and all the variables
x+23=0
We move all terms containing x to the left, all other terms to the right
x=-23
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