$\left(4x\right)+\left(-5x\right)+\left(4x\right)+\left(-5x\right)+\left(-x\right)$
$\left(5z-4k\right)^3$
$5+y=-6$
$x\:5\:y\:.\:4nx\:3$
$x^4-13x^2+6x$
$3xy^2+2xy-y^2;\:x=-2\:;\:y=3$
$9\left(x-2\right)^2=4$
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