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1/x+3/x-9=0
Domain of the equation: x!=0We multiply all the terms by the denominator
x∈R
-9*x+1+3=0
We add all the numbers together, and all the variables
-9x+4=0
We move all terms containing x to the left, all other terms to the right
-9x=-4
x=-4/-9
x=4/9
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