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Mathematics
OpenStudy (anonymous):

11r-5r+6r=168

OpenStudy (anonymous):

12r=168

OpenStudy (saifoo.khan):

11r-5r+6r=168 6r + 6r = 168 12r = 168 \[r = \frac{168}{12}\] r = 14

OpenStudy (anonymous):

divide both sidees by 12

OpenStudy (anonymous):

12r=168 r=14

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