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-2r-6=7*
We move all terms to the left:
-2r-6-(7*)=0
We add all the numbers together, and all the variables
-2r-6-0=0
We add all the numbers together, and all the variables
-2r-6=0
We move all terms containing r to the left, all other terms to the right
-2r=6
r=6/-2
r=-3
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