21=-3+6r

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Solution for 21=-3+6r equation:


21=-3+6r

We simplify the equation to the form, which is simple to understand 
21=-3+6r

We move all terms containing r to the left and all other terms to the right. 
-6r=-3-21

We simplify left and right side of the equation. 
-6r=-24

We divide both sides of the equation by -06 to get r. 
r=4

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