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37=-1.8r+1
We move all terms to the left:
37-(-1.8r+1)=0
We get rid of parentheses
1.8r-1+37=0
We add all the numbers together, and all the variables
1.8r+36=0
We move all terms containing r to the left, all other terms to the right
1.8r=-36
r=-36/1.8
r=-20
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