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-19.64+13.8r=15r-9.8
We move all terms to the left:
-19.64+13.8r-(15r-9.8)=0
We get rid of parentheses
13.8r-15r+9.8-19.64=0
We add all the numbers together, and all the variables
-1.2r-9.84=0
We move all terms containing r to the left, all other terms to the right
-1.2r=9.84
r=9.84/-1.2
r=-8+0.24/1.2
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