21=-6+7r-8

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Solution for 21=-6+7r-8 equation:


21=-6+7r-8

We simplify the equation to the form, which is simple to understand 
21=-6+7r-8

We move all terms containing r to the left and all other terms to the right. 
-7r=-6-8-21

We simplify left and right side of the equation. 
-7r=-35

We divide both sides of the equation by -07 to get r. 
r=5

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