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18-6.3r=49.5
We move all terms to the left:
18-6.3r-(49.5)=0
We add all the numbers together, and all the variables
-6.3r-31.5=0
We move all terms containing r to the left, all other terms to the right
-6.3r=31.5
r=31.5/-6.3
r=-5
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