$20+\left(-3-5\right)+\left(-3\right)-\left(-2\right)$
$9^5-7^3$
$x^2-7xy$
$\left|30+-90\right|$
$14-5\cdot9$
$3-2\cdot6-8$
$-xyz+6x^3y+2y^2x-10xyz-x^3y+8xyz$
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