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7r-5r+2=5r+2r
We simplify the equation to the form, which is simple to understand
7r-5r+2=5r+2r
We move all terms containing r to the left and all other terms to the right.
+7r-5r-5r-2r=-2
We simplify left and right side of the equation.
-5r=-2
We divide both sides of the equation by -5 to get r.
r=0.4
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