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13=1-2x+8
We move all terms to the left:
13-(1-2x+8)=0
We add all the numbers together, and all the variables
-(-2x+9)+13=0
We get rid of parentheses
2x-9+13=0
We add all the numbers together, and all the variables
2x+4=0
We move all terms containing x to the left, all other terms to the right
2x=-4
x=-4/2
x=-2
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