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2r-5-r=13+2r
We simplify the equation to the form, which is simple to understand
2r-5-r=13+2r
We move all terms containing r to the left and all other terms to the right.
+2r-1r-2r=+13+5
We simplify left and right side of the equation.
-1r=+18
We divide both sides of the equation by -1 to get r.
r=-18
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