3(n-5 )=21 so wt is n
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3(n-5)=22
=3n-15=22
=3n=22+15
=3n=37
=n=37/3
=n=12.33333
=3n-15=22
=3n=22+15
=3n=37
=n=37/3
=n=12.33333
kar13:
this is wrong answer check again
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