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13=-x+6
We move all terms to the left:
13-(-x+6)=0
We add all the numbers together, and all the variables
-(-1x+6)+13=0
We get rid of parentheses
1x-6+13=0
We add all the numbers together, and all the variables
x+7=0
We move all terms containing x to the left, all other terms to the right
x=-7
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