Question 507889
{{{  ((x^3)/2) - (x/2) = (2x^3-2x)/4 ) }}}
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{{{ (2x^3-2x)/4 = (2*x *(x^2-1))/(2*2) }}}
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{{{ (2*x *(x^2-1))/(2*2) = (x*(x+1)(x-1)) /2 }}}