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48=10r-2
We move all terms to the left:
48-(10r-2)=0
We get rid of parentheses
-10r+2+48=0
We add all the numbers together, and all the variables
-10r+50=0
We move all terms containing r to the left, all other terms to the right
-10r=-50
r=-50/-10
r=+5
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