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-5-r+2r=-8
We simplify the equation to the form, which is simple to understand
-5-r+2r=-8
We move all terms containing r to the left and all other terms to the right.
-1r+2r=-8+5
We simplify left and right side of the equation.
+1r=-3
We divide both sides of the equation by 1 to get r.
r=-3
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