Question 768338
parts x, y, z.
The number, Q=x+y+z
{{{y=2x}}}
{{{z=-7+y}}}


Question is: Find Q.
{{{Q=x+2x+y-7}}}
{{{Q=3x+2x-7}}}
{{{Q=5x-7}}}  and this is a far as can be found.  You need more information to go any more.