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-8r=-10r-18
We move all terms to the left:
-8r-(-10r-18)=0
We get rid of parentheses
-8r+10r+18=0
We add all the numbers together, and all the variables
2r+18=0
We move all terms containing r to the left, all other terms to the right
2r=-18
r=-18/2
r=-9
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