$21x\:+13y-7x-9y$
$\left(z+1\right)\left(3z-1\right)$
$\lim_{y\to-1}\left(\frac{y^3+1}{y+1}\right)^{\frac{1}{3}}$
$x^2-6x=-8$
$3\sin^2\left(x\right)=\sin\left(x\right)$
$-400ax+70b+48ax-9b+15ax$
$\frac{d}{dx}\cos^2\left(3x+1\right)-\sin^2\left(3x+1\right)$
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