$x^2\cdot\left(x^2-2xy+y^2\right)$
$26-32+\left(-13\right)+\left|-6\right|$
$\left(a^3+b\right)^2$
$x^2+5x+20$
$\left(x+2\right)-\left(x-2\right)-12x$
$-92m^2n-112mn^3;\:m=-3;\:n=-2$
$-\sin+3=\sin-4$
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