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52=7r+2+3r
We move all terms to the left:
52-(7r+2+3r)=0
We add all the numbers together, and all the variables
-(10r+2)+52=0
We get rid of parentheses
-10r-2+52=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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