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41.4=3.6(r+4.5)
We move all terms to the left:
41.4-(3.6(r+4.5))=0
We calculate terms in parentheses: -(3.6(r+4.5)), so:We get rid of parentheses
3.6(r+4.5)
We multiply parentheses
3.6r+16.2
Back to the equation:
-(3.6r+16.2)
-3.6r-16.2+41.4=0
We add all the numbers together, and all the variables
-3.6r+25.2=0
We move all terms containing r to the left, all other terms to the right
-3.6r=-25.2
r=-25.2/-3.6
r=+7
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