8r+4r=21

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Solution for 8r+4r=21 equation:


8r+4r=21

We simplify the equation to the form, which is simple to understand 
8r+4r=21

We move all terms containing r to the left and all other terms to the right. 
+8r+4r=+21

We simplify left and right side of the equation. 
+12r=+21

We divide both sides of the equation by 12 to get r. 
r=1.75

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