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r+21/4=4
We move all terms to the left:
r+21/4-(4)=0
determiningTheFunctionDomain r-4+21/4=0
We multiply all the terms by the denominator
r*4+21-4*4=0
We add all the numbers together, and all the variables
r*4+5=0
Wy multiply elements
4r+5=0
We move all terms containing r to the left, all other terms to the right
4r=-5
r=-5/4
r=-1+1/4
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