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0.8-2.5r=0.3
We move all terms to the left:
0.8-2.5r-(0.3)=0
We add all the numbers together, and all the variables
-2.5r+0.5=0
We move all terms containing r to the left, all other terms to the right
-2.5r=-0.5
r=-0.5/-2.5
r=0.5/2.5
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