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200/(r+10)=200/r-1
We move all terms to the left:
200/(r+10)-(200/r-1)=0
Domain of the equation: (r+10)!=0
We move all terms containing r to the left, all other terms to the right
r!=-10
r∈R
Domain of the equation: r-1)!=0We get rid of parentheses
r∈R
200/(r+10)-200/r+1=0
We calculate fractions
200r/(r^2+10r)+(-200r-2000)/(r^2+10r)+1=0
We multiply all the terms by the denominator
200r+(-200r-2000)+1*(r^2+10r)=0
We get rid of parentheses
200r-200r+1*(r^2+10r)-2000=0
We add all the numbers together, and all the variables
1*(r^2+10r)-2000=0
We move all terms containing r to the left, all other terms to the right
1*(r^2+10r)=2000
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