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-15-1/9r=8/9r+7
We move all terms to the left:
-15-1/9r-(8/9r+7)=0
Domain of the equation: 9r!=0
r!=0/9
r!=0
r∈R
Domain of the equation: 9r+7)!=0We get rid of parentheses
r∈R
-1/9r-8/9r-7-15=0
We multiply all the terms by the denominator
-7*9r-15*9r-1-8=0
We add all the numbers together, and all the variables
-7*9r-15*9r-9=0
Wy multiply elements
-63r-135r-9=0
We add all the numbers together, and all the variables
-198r-9=0
We move all terms containing r to the left, all other terms to the right
-198r=9
r=9/-198
r=-1/22
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