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12*30/x-6-12*30/x=3
We move all terms to the left:
12*30/x-6-12*30/x-(3)=0
Domain of the equation: x!=0We add all the numbers together, and all the variables
x∈R
12*30/x-12*30/x-9=0
We multiply all the terms by the denominator
-9*x+12*30-12*30=0
We add all the numbers together, and all the variables
-9x=0
x=0/-9
x=0
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