$-2+5\cdot\left(-3\right)$
$\left(x^{4}+6x^{3}-4x^{-2}-7x\right)\left(4x^{3}+6x^{2}-8x\right)$
$-4b+2b$
$\frac{24x^5y^3}{8xy^2}$
$a^2+b^2=1$
$169m^2-196$
$5p^2-p^2$
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