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2.8r=16.8/2.8
We move all terms to the left:
2.8r-(16.8/2.8)=0
We add all the numbers together, and all the variables
2.8r-(+16.8/2.8)=0
We get rid of parentheses
2.8r-16.8/2.8=0
We multiply all the terms by the denominator
(2.8r)*2.8-16.8=0
We add all the numbers together, and all the variables
(+2.8r)*2.8-16.8=0
We multiply parentheses
5.6r-16.8=0
We move all terms containing r to the left, all other terms to the right
5.6r=16.8
r=16.8/5.6
r=3+3.5527136788E-15/5.6
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