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10.80+2.75r=11.70
We move all terms to the left:
10.80+2.75r-(11.70)=0
We add all the numbers together, and all the variables
2.75r+10.80-(11.7)=0
We add all the numbers together, and all the variables
2.75r-0.9=0
We move all terms containing r to the left, all other terms to the right
2.75r=0.9
r=0.9/2.75
r=0.9/2.75
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