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-r+3r=6
We simplify the equation to the form, which is simple to understand
-r+3r=6
We move all terms containing r to the left and all other terms to the right.
-1r+3r=+6
We simplify left and right side of the equation.
+2r=+6
We divide both sides of the equation by 2 to get r.
r=3
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