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-19r+18=-4r+6-16r
We move all terms to the left:
-19r+18-(-4r+6-16r)=0
We add all the numbers together, and all the variables
-19r-(-20r+6)+18=0
We get rid of parentheses
-19r+20r-6+18=0
We add all the numbers together, and all the variables
r+12=0
We move all terms containing r to the left, all other terms to the right
r=-12
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