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2r+12=23.3
We simplify the equation to the form, which is simple to understand
2r+12=23.3
We move all terms containing r to the left and all other terms to the right.
+2r=+23.3-12
We simplify left and right side of the equation.
+2r=+11.3
We divide both sides of the equation by 2 to get r.
r=5.65
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