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-8=-4r+5r
We simplify the equation to the form, which is simple to understand
-8=-4r+5r
We move all terms containing r to the left and all other terms to the right.
+4r-5r=+8
We simplify left and right side of the equation.
-1r=+8
We divide both sides of the equation by -1 to get r.
r=-8
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