Question 644433
Let {{{ x }}} = his age now
{{{ x + 5 }}}  = his age in 5 years
{{{ x - 7 }}} = his age 7 years ago
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given:
{{{ x + 5 = 3*( x - 7 ) }}}
{{{ x + 5 = 3x - 21 }}}
{{{ 2x = 21 + 5 }}}
{{{ 2x = 26 }}}
{{{ x = 13 }}}
He is 13 now