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4(-4+r)=4(r-4)
We move all terms to the left:
4(-4+r)-(4(r-4))=0
We add all the numbers together, and all the variables
4(r-4)-(4(r-4))=0
We multiply parentheses
4r-(4(r-4))-16=0
We calculate terms in parentheses: -(4(r-4)), so:We get rid of parentheses
4(r-4)
We multiply parentheses
4r-16
Back to the equation:
-(4r-16)
4r-4r+16-16=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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