$\left(-7+0b\right)$
$\left(3x+5y\right)\left(3x-4y\right)$
$\left(\frac{5x}{6}+\frac{2}{7}\right)^2$
$24-1.9$
$\frac{d}{dx}\sqrt[2]{\frac{x-3}{x^4+3}}$
$\left(\sqrt{3}+tan10\right)\left(\sqrt{3}+tan20\right)$
$72x^2y^3-48y^3y^2+56xy^2$
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