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-7(r-2)+5(7r-1)=37
We move all terms to the left:
-7(r-2)+5(7r-1)-(37)=0
We multiply parentheses
-7r+35r+14-5-37=0
We add all the numbers together, and all the variables
28r-28=0
We move all terms containing r to the left, all other terms to the right
28r=28
r=28/28
r=1
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