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10^3-2x=42
We move all terms to the left:
10^3-2x-(42)=0
determiningTheFunctionDomain -2x-42+10^3=0
We add all the numbers together, and all the variables
-2x+958=0
We move all terms containing x to the left, all other terms to the right
-2x=-958
x=-958/-2
x=+479
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