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