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-16=-6r-40
We move all terms to the left:
-16-(-6r-40)=0
We get rid of parentheses
6r+40-16=0
We add all the numbers together, and all the variables
6r+24=0
We move all terms containing r to the left, all other terms to the right
6r=-24
r=-24/6
r=-4
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