$\left(2x\:+\:y\:-\:z\right)\left(2x\:-\:y\:+\:z\right)\:$
$\left(x+5\right)\left(x^2-5x+25\right)-125$
$3\cdot2+6$
$8x\:+3\:+4x\:-9+6$
$\left(4ht+2ab\right)^2$
$\frac{b}{12\sqrt{12}}$
$\left(\frac{5}{7}x^{n+1}-\frac{3}{10}ab^2\right)^2$
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