$x^3+4x^2-6+x$
$7t\cdot1$
$-18\cdot\left(-20\cdot18\right)$
$xy-x+4y-xy-x+4y-4$
$\left(3k+2y\right)\left(3x-2y\right)$
$6x^3+13x^2-13x-20$
$2\left(x-5\right)\le10x+14$
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