0.4-7=0.3r+2.8

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Solution for 0.4-7=0.3r+2.8 equation: 



0.4-7=0.3r+2.8

We move all terms to the left:

0.4-7-(0.3r+2.8)=0

We add all the numbers together, and all the variables

-(0.3r+2.8)-6.6=0

We get rid of parentheses

-0.3r-2.8-6.6=0

We add all the numbers together, and all the variables

-0.3r-9.4=0

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

-0.3r=9.4

r=9.4/-0.3

r=-31+0.1/0.3

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