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r-5.1=-8.6
We simplify the equation to the form, which is simple to understand
r-5.1=-8.6
We move all terms containing r to the left and all other terms to the right.
+1r=-8.6+5.1
We simplify left and right side of the equation.
+1r=-3.5
We divide both sides of the equation by 1 to get r.
r=-3.5
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