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2r+5=5r-15
We simplify the equation to the form, which is simple to understand
2r+5=5r-15
We move all terms containing r to the left and all other terms to the right.
+2r-5r=-15-5
We simplify left and right side of the equation.
-3r=-20
We divide both sides of the equation by -3 to get r.
r=6.6666666666667
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