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5(r-9)=5(r-9)
We move all terms to the left:
5(r-9)-(5(r-9))=0
We multiply parentheses
5r-(5(r-9))-45=0
We calculate terms in parentheses: -(5(r-9)), so:We get rid of parentheses
5(r-9)
We multiply parentheses
5r-45
Back to the equation:
-(5r-45)
5r-5r+45-45=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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