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-8(3r-2)=-8r+40
We move all terms to the left:
-8(3r-2)-(-8r+40)=0
We multiply parentheses
-24r-(-8r+40)+16=0
We get rid of parentheses
-24r+8r-40+16=0
We add all the numbers together, and all the variables
-16r-24=0
We move all terms containing r to the left, all other terms to the right
-16r=24
r=24/-16
r=-1+1/2
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