r=21-3

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Solution for r=21-3 equation:


r=21-3

We simplify the equation to the form, which is simple to understand 
r=21-3

We move all terms containing r to the left and all other terms to the right. 
+1r=+21-3

We simplify left and right side of the equation. 
+1r=+18

We divide both sides of the equation by 1 to get r. 
r=18

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