#2x^3-8x=0#
#rarrcolor(white)("XXX")(2)(x)(x^2-4)=0#
#rarrcolor(white)("XXX")(2)(x)(x+2)(x-2)=0#
#rarrcolor(white)("XXX")x=0color(white)("XX")or color(white)("XX")x+2=0color(white)("XXX")orcolor(white)("XX")x-2=0#
#rarrcolor(white)("XXX")x=0color(white)("XX")orcolor(white)("XX")x=-2color(white)("XXXX")orcolor(white)("XX")x=+2#