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-18=-26-r
We move all terms to the left:
-18-(-26-r)=0
We add all the numbers together, and all the variables
-(-1r-26)-18=0
We get rid of parentheses
1r+26-18=0
We add all the numbers together, and all the variables
r+8=0
We move all terms containing r to the left, all other terms to the right
r=-8
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