-2r+5r=21

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Solution for -2r+5r=21 equation:


-2r+5r=21

We simplify the equation to the form, which is simple to understand 
-2r+5r=21

We move all terms containing r to the left and all other terms to the right. 
-2r+5r=+21

We simplify left and right side of the equation. 
+3r=+21

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

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