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-15-6r-5+8=8r+4r
We simplify the equation to the form, which is simple to understand
-15-6r-5+8=8r+4r
We move all terms containing r to the left and all other terms to the right.
-6r-8r-4r=+15+5-8
We simplify left and right side of the equation.
-18r=+12
We divide both sides of the equation by -18 to get r.
r=-0.666666666667
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