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2.50/r=21.50
We simplify the equation to the form, which is simple to understand
2.50/r=21.50
We move all terms containing r to the left and all other terms to the right.
+1r=+21.5
We simplify left and right side of the equation.
+1r=+21.5
We divide both sides of the equation by 1 to get r.
r=21.5
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