4r-12=9+r

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Solution for 4r-12=9+r equation:


4r-12=9+r

We simplify the equation to the form, which is simple to understand 
4r-12=9+r

We move all terms containing r to the left and all other terms to the right. 
+4r-1r=+9+12

We simplify left and right side of the equation. 
+3r=+21

We divide both sides of the equation by 3 to get r. 
r=7

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