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0.3r+0.2=1/7
We move all terms to the left:
0.3r+0.2-(1/7)=0
We add all the numbers together, and all the variables
0.3r+0.2-(+1/7)=0
We get rid of parentheses
0.3r+0.2-1/7=0
We multiply all the terms by the denominator
(0.3r)*7-1+(0.2)*7=0
We add all the numbers together, and all the variables
(+0.3r)*7-1+(0.2)*7=0
We add all the numbers together, and all the variables
(+0.3r)*7+0.4=0
We multiply parentheses
0r+0.4=0
We add all the numbers together, and all the variables
r+0.4=0
We move all terms containing r to the left, all other terms to the right
r=-0.4
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