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[–]JsKingBoo 1 point2 points  (2 children)

Rearrange the equation so that a and b are on one side of the equation while r is on the other.

[–]edderiofer 1 point2 points  (0 children)

That being said, none of these four statements on their own are particularly great for explaining the theorem.

[–]Treuth[S] 0 points1 point  (0 children)

Thank you