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4/5(r-10)=r+2
We move all terms to the left:
4/5(r-10)-(r+2)=0
Domain of the equation: 5(r-10)!=0We get rid of parentheses
r∈R
4/5(r-10)-r-2=0
We multiply all the terms by the denominator
-r*5(r-10)-2*5(r-10)+4=0
Wy multiply elements
-5r^2(r-10r(r+4=0
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