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275.5=r-1.235
We move all terms to the left:
275.5-(r-1.235)=0
We get rid of parentheses
-r+1.235+275.5=0
We add all the numbers together, and all the variables
-1r+276.735=0
We move all terms containing r to the left, all other terms to the right
-r=-276.735
r=-276.735/-1
r=276+0.73500000000001/1
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