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7+10r-9=8+9r
We move all terms to the left:
7+10r-9-(8+9r)=0
We add all the numbers together, and all the variables
10r-(9r+8)+7-9=0
We add all the numbers together, and all the variables
10r-(9r+8)-2=0
We get rid of parentheses
10r-9r-8-2=0
We add all the numbers together, and all the variables
r-10=0
We move all terms containing r to the left, all other terms to the right
r=10
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