12+9r-4R-4=13

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Solution for 12+9r-4R-4=13 equation:


12+9r-4r-4=13

We simplify the equation to the form, which is simple to understand 
12+9r-4r-4=13

We move all terms containing r to the left and all other terms to the right. 
+9r-4r=+13-12+4

We simplify left and right side of the equation. 
+5r=+5

We divide both sides of the equation by 5 to get r. 
r=1

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