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-4a+(-7)=39
We move all terms to the left:
-4a+(-7)-(39)=0
determiningTheFunctionDomain -4a-39+(-7)=0
We add all the numbers together, and all the variables
-4a-46=0
We move all terms containing a to the left, all other terms to the right
-4a=46
a=46/-4
a=-11+1/2
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