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-10r=-9r-4
We move all terms to the left:
-10r-(-9r-4)=0
We get rid of parentheses
-10r+9r+4=0
We add all the numbers together, and all the variables
-1r+4=0
We move all terms containing r to the left, all other terms to the right
-r=-4
r=-4/-1
r=+4
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