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-3=(r)/(6)
We move all terms to the left:
-3-((r)/(6))=0
We add all the numbers together, and all the variables
-(+r/6)-3=0
We get rid of parentheses
-r/6-3=0
We multiply all the terms by the denominator
-r-3*6=0
We add all the numbers together, and all the variables
-1r-18=0
We move all terms containing r to the left, all other terms to the right
-r=18
r=18/-1
r=-18
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