15=7+3r-7r

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Solution for 15=7+3r-7r equation:


15=7+3r-7r

We simplify the equation to the form, which is simple to understand 
15=7+3r-7r

We move all terms containing r to the left and all other terms to the right. 
-3r+7r=+7-15

We simplify left and right side of the equation. 
+4r=-8

We divide both sides of the equation by 4 to get r. 
r=-2

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