Question 830439
Let the number = {{{ n }}}
{{{ (1/3)*n - 12 = 5 }}}
Multiply both sides by {{{3}}}
{{{ n - 36 = 15 }}}
Add {{{36}}} to both sides
{{{ n = 51 }}}
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check answer:
{{{ (1/3)*51 = 17 }}}
{{{ 17 - 12 = 5 }}}
OK