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-11.88+6.6r=6.64r+5.9r
We move all terms to the left:
-11.88+6.6r-(6.64r+5.9r)=0
We add all the numbers together, and all the variables
6.6r-(+12.54r)-11.88=0
We get rid of parentheses
6.6r-12.54r-11.88=0
We add all the numbers together, and all the variables
-5.94r-11.88=0
We move all terms containing r to the left, all other terms to the right
-5.94r=11.88
r=11.88/-5.94
r=-2
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