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-13(4r+6)+9r=0
We simplify the equation to the form, which is simple to understand
-13(4r+6)+9r=0
Reorder the terms in parentheses
+(-52r-78)+9r=0
Remove unnecessary parentheses
-52r-78+9r=0
We move all terms containing r to the left and all other terms to the right.
-52r+9r=0+78
We simplify left and right side of the equation.
-43r=+78
We divide both sides of the equation by -43 to get r.
r=-1.8139534883721
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