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-5(r+6)=-40
We move all terms to the left:
-5(r+6)-(-40)=0
We add all the numbers together, and all the variables
-5(r+6)+40=0
We multiply parentheses
-5r-30+40=0
We add all the numbers together, and all the variables
-5r+10=0
We move all terms containing r to the left, all other terms to the right
-5r=-10
r=-10/-5
r=+2
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