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10.4r+9.9=8.6r+15.63-8.97
We simplify the equation to the form, which is simple to understand
10.4r+9.9=8.6r+15.63-8.97
We move all terms containing r to the left and all other terms to the right.
+10.4r-8.6r=+15.63-8.97-9.9
We simplify left and right side of the equation.
+1.8r=-3.24
We divide both sides of the equation by 1.8 to get r.
r=-1.8
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