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15+8=11r-20
We move all terms to the left:
15+8-(11r-20)=0
We add all the numbers together, and all the variables
-(11r-20)+23=0
We get rid of parentheses
-11r+20+23=0
We add all the numbers together, and all the variables
-11r+43=0
We move all terms containing r to the left, all other terms to the right
-11r=-43
r=-43/-11
r=3+10/11
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