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12-12x+(-20)-8x=20
We move all terms to the left:
12-12x+(-20)-8x-(20)=0
determiningTheFunctionDomain -12x-8x+12-20+(-20)=0
We add all the numbers together, and all the variables
-20x-28=0
We move all terms containing x to the left, all other terms to the right
-20x=28
x=28/-20
x=-1+2/5
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