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OpenStudy (anonymous):
11r-5r+6r=168
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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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