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3r-5r+r+8=0
We simplify the equation to the form, which is simple to understand
3r-5r+r+8=0
We move all terms containing r to the left and all other terms to the right.
+3r-5r+1r=0-8
We simplify left and right side of the equation.
-1r=-8
We divide both sides of the equation by -1 to get r.
r=8
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