$\left(4a-7\right)^2$
$21.79\cdot17.85$
$\left(x\right)\left(-3-5x+7x^2\right)$
$x^3-3x^2+6x-2;\:x=2$
$4\left(x+3\right)-8\le5-x$
$x^8+z\:sin\left(xyz\right)=0\:$
$\left(3x^2+4x-7\right)^2-2\left(3x^2+4x-7\right)-5$
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