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