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4(r+20)=1/2(20r+400)
We move all terms to the left:
4(r+20)-(1/2(20r+400))=0
Domain of the equation: 2(20r+400))!=0We multiply parentheses
r∈R
4r-(1/2(20r+400))+80=0
We multiply all the terms by the denominator
4r*2(20r+400))-(1+80*2(20r+400))=0
Wy multiply elements
8r^2(2+160r(2=0
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