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-4+1/3r=0
Domain of the equation: 3r!=0We multiply all the terms by the denominator
r!=0/3
r!=0
r∈R
-4*3r+1=0
Wy multiply elements
-12r+1=0
We move all terms containing r to the left, all other terms to the right
-12r=-1
r=-1/-12
r=1/12
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