$1-3\left(-7\right)$
$7x^2+4x-20$
$\frac{-63m^3n^3}{9m^2n^5}$
$\left(4a^3b^2-2a\right)^2$
$2x-3<3x-6$
$8m+3-2-10+9m$
$z^2-16z+8$
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