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1/4r=12
We move all terms to the left:
1/4r-(12)=0
Domain of the equation: 4r!=0We multiply all the terms by the denominator
r!=0/4
r!=0
r∈R
-12*4r+1=0
Wy multiply elements
-48r+1=0
We move all terms containing r to the left, all other terms to the right
-48r=-1
r=-1/-48
r=1/48
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