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2r-13=8r+5
We simplify the equation to the form, which is simple to understand
2r-13=8r+5
We move all terms containing r to the left and all other terms to the right.
+2r-8r=+5+13
We simplify left and right side of the equation.
-6r=+18
We divide both sides of the equation by -6 to get r.
r=-3
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