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(2r-13)-(-6r+4)=r=
We move all terms to the left:
(2r-13)-(-6r+4)-(r)=0
We add all the numbers together, and all the variables
-1r+(2r-13)-(-6r+4)=0
We get rid of parentheses
-1r+2r+6r-13-4=0
We add all the numbers together, and all the variables
7r-17=0
We move all terms containing r to the left, all other terms to the right
7r=17
r=17/7
r=2+3/7
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