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6(r+8r)-8=100
We move all terms to the left:
6(r+8r)-8-(100)=0
We add all the numbers together, and all the variables
6(+9r)-8-100=0
We add all the numbers together, and all the variables
6(+9r)-108=0
We multiply parentheses
54r-108=0
We move all terms containing r to the left, all other terms to the right
54r=108
r=108/54
r=2
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