Question 1135751

The formulation is:
{{{ x(x+1)(x+2) = x^3+21 }}}
{{{ x^3+3x^2+2x = x^3+21 }}}
{{{  3x^2+2x-21 = 0 }}}
{{{ (3x-7)(x+3) = 0 }}}

x = -3 and  x = 7/3  are solutions to this equation, but only
{{{ highlight( x = -3 ) }}} is an integer solution<br>

Checked by plugging in x=-3.