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12.9r=0
We simplify the equation to the form, which is simple to understand
12.9r=0
We move all terms containing r to the left and all other terms to the right.
+12.9r=0
We simplify left and right side of the equation.
+12.9r=0
We divide both sides of the equation by 12.9 to get r.
r=0
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