15=1-8r+r

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Solution for 15=1-8r+r equation:


15=1-8r+r

We simplify the equation to the form, which is simple to understand 
15=1-8r+r

We move all terms containing r to the left and all other terms to the right. 
+8r-1r=+1-15

We simplify left and right side of the equation. 
+7r=-14

We divide both sides of the equation by 7 to get r. 
r=-2

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