0,3r=2.1

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Solution for 0,3r=2.1 equation: 



0.3r=2.1

We move all terms to the left:

0.3r-(2.1)=0

We add all the numbers together, and all the variables

0.3r-2.1=0

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

0.3r=2.1

r=2.1/0.3

r=7

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