-7r+21=0

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Solution for -7r+21=0 equation:


-7r+21=0

We simplify the equation to the form, which is simple to understand 
-7r+21=0

We move all terms containing r to the left and all other terms to the right. 
-7r=0-21

We simplify left and right side of the equation. 
-7r=-21

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

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