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(1+2r)/5=7
We move all terms to the left:
(1+2r)/5-(7)=0
We add all the numbers together, and all the variables
(2r+1)/5-7=0
We multiply all the terms by the denominator
(2r+1)-7*5=0
We add all the numbers together, and all the variables
(2r+1)-35=0
We get rid of parentheses
2r+1-35=0
We add all the numbers together, and all the variables
2r-34=0
We move all terms containing r to the left, all other terms to the right
2r=34
r=34/2
r=17
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