I dont know what category , on my paper it say Solving Equations By Adding Or Subtracting (:

 

- Any Help Is Much Needed
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You want to get r by itself on one side of the equation.  to do that you need to move 6 from 1 side of the equation to the other.  You can do this by subtracting it from both sides

-19  =  r+6

-6          -6

-25=r
by

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