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7/9r=1
We move all terms to the left:
7/9r-(1)=0
Domain of the equation: 9r!=0We multiply all the terms by the denominator
r!=0/9
r!=0
r∈R
-1*9r+7=0
Wy multiply elements
-9r+7=0
We move all terms containing r to the left, all other terms to the right
-9r=-7
r=-7/-9
r=7/9
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