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r - 1.71 = 12.9
We simplify the equation to the form, which is simple to understand
r-1.71=12.9
We move all terms containing r to the left and all other terms to the right.
+1r=+12.9+1.71
We simplify left and right side of the equation.
+1r=+14.61
We divide both sides of the equation by 1 to get r.
r=14.61
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