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2r+49=8r+40
We move all terms to the left:
2r+49-(8r+40)=0
We get rid of parentheses
2r-8r-40+49=0
We add all the numbers together, and all the variables
-6r+9=0
We move all terms containing r to the left, all other terms to the right
-6r=-9
r=-9/-6
r=1+1/2
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