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17=-3+2r
We move all terms to the left:
17-(-3+2r)=0
We add all the numbers together, and all the variables
-(2r-3)+17=0
We get rid of parentheses
-2r+3+17=0
We add all the numbers together, and all the variables
-2r+20=0
We move all terms containing r to the left, all other terms to the right
-2r=-20
r=-20/-2
r=+10
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