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2r-2.9=19.24
We move all terms to the left:
2r-2.9-(19.24)=0
We add all the numbers together, and all the variables
2r-22.14=0
We move all terms containing r to the left, all other terms to the right
2r=22.14
r=22.14/2
r=11+0.14/2
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