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159=r+35.7
We move all terms to the left:
159-(r+35.7)=0
We get rid of parentheses
-r-35.7+159=0
We add all the numbers together, and all the variables
-1r+123.3=0
We move all terms containing r to the left, all other terms to the right
-r=-123.3
r=-123.3/-1
r=123+0.3/1
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