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-3(1+6r)=129
We move all terms to the left:
-3(1+6r)-(129)=0
We add all the numbers together, and all the variables
-3(6r+1)-129=0
We multiply parentheses
-18r-3-129=0
We add all the numbers together, and all the variables
-18r-132=0
We move all terms containing r to the left, all other terms to the right
-18r=132
r=132/-18
r=-7+1/3
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