r/0,4=0.8

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Solution for r/0,4=0.8 equation: 



r/0.4=0.8

We move all terms to the left:

r/0.4-(0.8)=0

We add all the numbers together, and all the variables

r/0.4-0.8=0

We multiply all the terms by the denominator


r-(0.8)*0.4=0

We add all the numbers together, and all the variables

r-0.32=0

We move all terms containing r to the left, all other terms to the right

r=0.32

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