r/0.4=0.8

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Solution for r/0.4=0.8 equation:


r/0.4=0.8

We simplify the equation to the form, which is simple to understand 
r/0.4=0.8

Simplifying:
+2.5r=0.8

We move all terms containing r to the left and all other terms to the right. 
+2.5r=0.8

We simplify left and right side of the equation. 
+2.5r=0.8

We divide both sides of the equation by 2.5 to get r. 
r=0.32

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