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7+11r-1=6r+78-4r
We move all terms to the left:
7+11r-1-(6r+78-4r)=0
We add all the numbers together, and all the variables
11r-(2r+78)+7-1=0
We add all the numbers together, and all the variables
11r-(2r+78)+6=0
We get rid of parentheses
11r-2r-78+6=0
We add all the numbers together, and all the variables
9r-72=0
We move all terms containing r to the left, all other terms to the right
9r=72
r=72/9
r=8
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