Question 701736
{{{5d-8d-4<=-4+3d}}}


{{{-3d-4<=-4+3d}}}...........add {{{3d}}} to both sides


{{{-3d+3d-4<=-4+3d+3d}}}


{{{-cross(3d)+cross(3d)-4<=-4+6d}}}


{{{-4<=-4+6d}}}..........add {{{4}}} to both sides


{{{-4+4<=-4+4+6d}}}


{{{0<=6d}}}


{{{0<=d}}}

so, {{{d}}} is element of the set {  {{{0}}},{{{1}}},{{{2}}},{{{3}}}.....}

or interval notation:

[{{{0}}},{{{infinity}}})