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10r-40=10(r-4)
We move all terms to the left:
10r-40-(10(r-4))=0
We calculate terms in parentheses: -(10(r-4)), so:We get rid of parentheses
10(r-4)
We multiply parentheses
10r-40
Back to the equation:
-(10r-40)
10r-10r+40-40=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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