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3r+7-6r=5+6r-6r-16
We move all terms to the left:
3r+7-6r-(5+6r-6r-16)=0
We add all the numbers together, and all the variables
3r-6r+7-(-11)=0
We add all the numbers together, and all the variables
-3r+18=0
We move all terms containing r to the left, all other terms to the right
-3r=-18
r=-18/-3
r=+6
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