6×{(2b/3)+12}=5×(b+12)
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=> 6×{2b/3+12} = 5b+60
=> 4b+72=5b+60
=> 5b-4b =72-60
=> b = 12
=> 4b+72=5b+60
=> 5b-4b =72-60
=> b = 12
mksha:
it is very easy
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