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120/a=12
We move all terms to the left:
120/a-(12)=0
Domain of the equation: a!=0We multiply all the terms by the denominator
a∈R
-12*a+120=0
We add all the numbers together, and all the variables
-12a+120=0
We move all terms containing a to the left, all other terms to the right
-12a=-120
a=-120/-12
a=+10
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