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5r-1+18=-19+8r
We move all terms to the left:
5r-1+18-(-19+8r)=0
We add all the numbers together, and all the variables
5r-(8r-19)-1+18=0
We add all the numbers together, and all the variables
5r-(8r-19)+17=0
We get rid of parentheses
5r-8r+19+17=0
We add all the numbers together, and all the variables
-3r+36=0
We move all terms containing r to the left, all other terms to the right
-3r=-36
r=-36/-3
r=+12
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