r+3.4-2.5r=0.4

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Solution for r+3.4-2.5r=0.4 equation: 



r+3.4-2.5r=0.4

We move all terms to the left:

r+3.4-2.5r-(0.4)=0

We add all the numbers together, and all the variables

-1.5r+3=0

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

-1.5r=-3

r=-3/-1.5

r=+2

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