(r-4)=9

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Solution for (r-4)=9 equation:


(r-4)=9

We simplify the equation to the form, which is simple to understand 
(r-4)=9

Remove unnecessary parentheses
r-4=9

We move all terms containing r to the left and all other terms to the right. 
+1r=+9+4

We simplify left and right side of the equation. 
+1r=+13

We divide both sides of the equation by 1 to get r. 
r=13

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