Question 408647


{{{18 = -a + 2}}}......add {{{a}}} to both sides

{{{18+a = -a+a+ 2}}}

{{{18+a = -cross(a)+cross(a)+ 2}}}

{{{18+a = 2}}}..........add {{{-18}}} to both sides

{{{18+a -18 = 2-18}}}

{{{cross(18)+a -cross(18) = -16}}}

{{{a=-16}}}