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21/44r=10
We move all terms to the left:
21/44r-(10)=0
Domain of the equation: 44r!=0We multiply all the terms by the denominator
r!=0/44
r!=0
r∈R
-10*44r+21=0
Wy multiply elements
-440r+21=0
We move all terms containing r to the left, all other terms to the right
-440r=-21
r=-21/-440
r=21/440
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