30=9-7r

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Solution for 30=9-7r equation:


30=9-7r

We simplify the equation to the form, which is simple to understand 
30=9-7r

We move all terms containing r to the left and all other terms to the right. 
+7r=+9-30

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

We divide both sides of the equation by 07 to get r. 
r=-3

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