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-x+(-13)=20
We move all terms to the left:
-x+(-13)-(20)=0
determiningTheFunctionDomain -x-20+(-13)=0
We add all the numbers together, and all the variables
-1x-33=0
We move all terms containing x to the left, all other terms to the right
-x=33
x=33/-1
x=-33
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