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4/3r=12
We move all terms to the left:
4/3r-(12)=0
Domain of the equation: 3r!=0We multiply all the terms by the denominator
r!=0/3
r!=0
r∈R
-12*3r+4=0
Wy multiply elements
-36r+4=0
We move all terms containing r to the left, all other terms to the right
-36r=-4
r=-4/-36
r=1/9
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