$5x^2y+3y^2z-2xz;\:x=-2;\:y=-4\:z=4$
$9x^2+4\left(-2x+1\right)$
$\left(2x^{2a-1}\right)\left(6x^2\right)$
$10\cdot3,5+0,5-5+2$
$\left(xy-8z\right)^3$
$u^2\:-\:24u\:+\:144$
$\left(3x^4+7x^3+9x^2-x-6\right)$
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