$13\left(4+13\right)$
$y'=2xy+3y-4x-6$
$\log\left(x+1\right)-\log\left(4\right)=3$
$\frac{7x^3-x^2-7}{x^2+7}$
$\left(b^{2n+3}+a^{3n}-4\right)\left(b^{2n+3}-5+a^{3n}\right)$
$\left(4xy-3z\right)^2$
$\left(12x^3y^5z^4\right).\left(3x^2y^2z^3\right)$
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