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-1/(87-r)=-7
We move all terms to the left:
-1/(87-r)-(-7)=0
Domain of the equation: (87-r)!=0We add all the numbers together, and all the variables
We move all terms containing r to the left, all other terms to the right
-r!=-87
r!=-87/-1
r!=+87
r∈R
-1/(-1r+87)-(-7)=0
We add all the numbers together, and all the variables
-1/(-1r+87)+7=0
We multiply all the terms by the denominator
7*(-1r+87)-1=0
We multiply parentheses
-7r+609-1=0
We add all the numbers together, and all the variables
-7r+608=0
We move all terms containing r to the left, all other terms to the right
-7r=-608
r=-608/-7
r=86+6/7
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