-0.5=0.3r+0.4.

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Solution for -0.5=0.3r+0.4. equation: 



-0.5=0.3r+0.4.

We move all terms to the left:

-0.5-(0.3r+0.4.)=0

We add all the numbers together, and all the variables

-(+0.3r)-0.5=0

We get rid of parentheses

-0.3r-0.5=0

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

-0.3r=0.5

r=0.5/-0.3

r=-1+0.2/0.3

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