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-5.1=r/18.9
We move all terms to the left:
-5.1-(r/18.9)=0
We add all the numbers together, and all the variables
-(+r/18.9)-5.1=0
We get rid of parentheses
-r/18.9-5.1=0
We multiply all the terms by the denominator
-r-(5.1)*18.9=0
We add all the numbers together, and all the variables
-1r-96.39=0
We move all terms containing r to the left, all other terms to the right
-r=96.39
r=96.39/-1
r=-96+0.39/1
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