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-8+2r/10=1
We move all terms to the left:
-8+2r/10-(1)=0
We add all the numbers together, and all the variables
2r/10-9=0
We multiply all the terms by the denominator
2r-9*10=0
We add all the numbers together, and all the variables
2r-90=0
We move all terms containing r to the left, all other terms to the right
2r=90
r=90/2
r=45
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