21=6r-7r

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Solution for 21=6r-7r equation:


21=6r-7r

We simplify the equation to the form, which is simple to understand 
21=6r-7r

We move all terms containing r to the left and all other terms to the right. 
-6r+7r=-21

We simplify left and right side of the equation. 
+1r=-21

We divide both sides of the equation by 1 to get r. 
r=-21

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