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13=18-x
We move all terms to the left:
13-(18-x)=0
We add all the numbers together, and all the variables
-(-1x+18)+13=0
We get rid of parentheses
1x-18+13=0
We add all the numbers together, and all the variables
x-5=0
We move all terms containing x to the left, all other terms to the right
x=5
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