![2[l*w+w*h+h*l]\\=2[(4x+3)*x+x*(3x-1)+(3x-1)*(4x+3)]](/tpl/images/0520/2783/c8983.png)
![2[(4x^2+3x)+(3x^2-x)+(12x^2+9x-4x-3)]\\2[4x^2+3x+3x^2-x+12x^2+5x-3)]\\2[19x^2+7x-3]\\38x^2+14x-6](/tpl/images/0520/2783/8a7ba.png)
Fine in expanded form the total surface area
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