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2r=20+80r/40+2r
We move all terms to the left:
2r-(20+80r/40+2r)=0
Domain of the equation: 40+2r)!=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
2r)!=-40
r!=-40/1
r!=-40
r∈R
2r-(2r+80r/40+20)=0
We get rid of parentheses
2r-2r-80r/40-20=0
We multiply all the terms by the denominator
2r*40-2r*40-80r-20*40=0
We add all the numbers together, and all the variables
-80r+2r*40-2r*40-800=0
Wy multiply elements
-80r+80r-80r-800=0
We add all the numbers together, and all the variables
-80r-800=0
We move all terms containing r to the left, all other terms to the right
-80r=800
r=800/-80
r=-10
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