2.9=r+5.7

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Solution for 2.9=r+5.7 equation: 



2.9=r+5.7

We move all terms to the left:

2.9-(r+5.7)=0

We get rid of parentheses

-r-5.7+2.9=0

We add all the numbers together, and all the variables

-1r-2.8=0

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

-r=2.8

r=2.8/-1

r=-2+0.8/1

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