Question 1057353
{{{ (3x^2 - 29x + 56)/(x - 7) }}}
= {{{ 3x +  (-8x + 56)/ (x - 7) }}}
= {{{ 3x - 8 }}}   (with no remainder)

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Check:
{{{ (3x-8)(x-7) = (3x^2 - 21x - 8x + 56) }}}
{{{  (3x-8)(x-7) = (3x^2 - 29x + 56) }}}   (ok)