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r*2+8r+13=0
We simplify the equation to the form, which is simple to understand
r*2+8r+13=0
We move all terms containing r to the left and all other terms to the right.
+2r+8r=0-13
We simplify left and right side of the equation.
+10r=-13
We divide both sides of the equation by 10 to get r.
r=-1.3
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