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-2(r-19)=-2
We move all terms to the left:
-2(r-19)-(-2)=0
We add all the numbers together, and all the variables
-2(r-19)+2=0
We multiply parentheses
-2r+38+2=0
We add all the numbers together, and all the variables
-2r+40=0
We move all terms containing r to the left, all other terms to the right
-2r=-40
r=-40/-2
r=+20
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