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3x+4+2x-12+x+7+()=90
We move all terms to the left:
3x+4+2x-12+x+7+()-(90)=0
determiningTheFunctionDomain 3x+2x+x+4-12+7-90+()=0
We add all the numbers together, and all the variables
6x=0
x=0/6
x=0
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