2.8r+83=39

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Solution for 2.8r+83=39 equation: 



2.8r+83=39

We move all terms to the left:

2.8r+83-(39)=0

We add all the numbers together, and all the variables

2.8r+44=0

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

2.8r=-44

r=-44/2.8

r=-15+1/1.4

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