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12/a=1
We move all terms to the left:
12/a-(1)=0
Domain of the equation: a!=0We multiply all the terms by the denominator
a∈R
-1*a+12=0
We add all the numbers together, and all the variables
-1a+12=0
We move all terms containing a to the left, all other terms to the right
-a=-12
a=-12/-1
a=+12
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