-6.4=-0.4r

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Solution for -6.4=-0.4r equation: 



-6.4=-0.4r

We move all terms to the left:

-6.4-(-0.4r)=0

We get rid of parentheses

0.4r-6.4=0

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

0.4r=6.4

r=6.4/0.4

r=16

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