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41=2(4r+5)-9
We move all terms to the left:
41-(2(4r+5)-9)=0
We calculate terms in parentheses: -(2(4r+5)-9), so:We get rid of parentheses
2(4r+5)-9
We multiply parentheses
8r+10-9
We add all the numbers together, and all the variables
8r+1
Back to the equation:
-(8r+1)
-8r-1+41=0
We add all the numbers together, and all the variables
-8r+40=0
We move all terms containing r to the left, all other terms to the right
-8r=-40
r=-40/-8
r=+5
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