[tex]\displaystyle\bf\\\underbrace{(6-2x)(36+12x+4x^{2} )}_{6^{3}-(2x)^{3}} =72x-8x^{3} \\\\216-8x^{3} -72x+8x^{3} =0\\\\72x=216\\\\x=3[/tex]
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[tex]\displaystyle\bf\\\underbrace{(6-2x)(36+12x+4x^{2} )}_{6^{3}-(2x)^{3}} =72x-8x^{3} \\\\216-8x^{3} -72x+8x^{3} =0\\\\72x=216\\\\x=3[/tex]