0.8-0.4r=-0.75

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Solution for 0.8-0.4r=-0.75 equation: 



0.8-0.4r=-0.75

We move all terms to the left:

0.8-0.4r-(-0.75)=0

We add all the numbers together, and all the variables

-0.4r+1.55=0

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

-0.4r=-1.55

r=-1.55/-0.4

r=3+0.35/0.4

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