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1.1r+1.2r-54=-10
We move all terms to the left:
1.1r+1.2r-54-(-10)=0
We add all the numbers together, and all the variables
2.3r-44=0
We move all terms containing r to the left, all other terms to the right
2.3r=44
r=44/2.3
r=19+0.3/2.3
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