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4r+4=16r+8
We simplify the equation to the form, which is simple to understand
4r+4=16r+8
We move all terms containing r to the left and all other terms to the right.
+4r-16r=+8-4
We simplify left and right side of the equation.
-12r=+4
We divide both sides of the equation by -12 to get r.
r=-0.33333333333333
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