Question 498227
(a)
{{{ x + 3 }}}
(b)
{{{ x + x + 3 }}} = 
{{{ 2x + 3 }}}
(c)
{{{ x + 12 + x + 3 + 12 }}} =
{{{ 2x + 27 }}}
(d)
{{{ 2x + 27 = x + 3 + 30 }}}
{{{ x = 33 - 27 }}}
(e)
{{{ x = 6 }}}
{{{ x + 3 = 9 }}}
Andrew is 6, Stephanie is 9 
check:
In 12 years,
{{{ 2x + 27 = 12 + 27 }}} = 
{{{ 39 }}}
{{{ 39 = x + 33 }}}
{{{ x = 6 }}}
OK