$-4+-8\cdot7+-2$
$\lim_{x\to\infty}\left(3^x-x^3\right)$
$11a^2b-12ab^2$
$\frac{13y^8z^3}{4x^5y^5}$
$28x^2+x^2$
$-18\left(-3\right)$
$-3\left(1\right)\left(-1\right)\left(-2\right)$
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