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13=1/3y+9
We move all terms to the left:
13-(1/3y+9)=0
Domain of the equation: 3y+9)!=0We get rid of parentheses
y∈R
-1/3y-9+13=0
We multiply all the terms by the denominator
-9*3y+13*3y-1=0
Wy multiply elements
-27y+39y-1=0
We add all the numbers together, and all the variables
12y-1=0
We move all terms containing y to the left, all other terms to the right
12y=1
y=1/12
y=1/12
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