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-4=-r+1/3
We move all terms to the left:
-4-(-r+1/3)=0
We add all the numbers together, and all the variables
-(-1r+1/3)-4=0
We get rid of parentheses
1r-4-1/3=0
We multiply all the terms by the denominator
1r*3-1-4*3=0
We add all the numbers together, and all the variables
1r*3-13=0
Wy multiply elements
3r-13=0
We move all terms containing r to the left, all other terms to the right
3r=13
r=13/3
r=4+1/3
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