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-4=-r+105
We move all terms to the left:
-4-(-r+105)=0
We add all the numbers together, and all the variables
-(-1r+105)-4=0
We get rid of parentheses
1r-105-4=0
We add all the numbers together, and all the variables
r-109=0
We move all terms containing r to the left, all other terms to the right
r=109
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