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4^2-4x=140
We move all terms to the left:
4^2-4x-(140)=0
determiningTheFunctionDomain -4x-140+4^2=0
We add all the numbers together, and all the variables
-4x-124=0
We move all terms containing x to the left, all other terms to the right
-4x=124
x=124/-4
x=-31
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