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-8=-4r+8r
We simplify the equation to the form, which is simple to understand
-8=-4r+8r
We move all terms containing r to the left and all other terms to the right.
+4r-8r=+8
We simplify left and right side of the equation.
-4r=+8
We divide both sides of the equation by -4 to get r.
r=-2
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