$90\cdot33$
$y-7.8=10.1$
$\frac{d}{dx}x^x+\:8$
$\frac{\sin^2x+1}{\cos\left(x\right)}$
$3\left(xy+5\left(-3xy+x\right)\right)$
$\lim_{x\to-3}\left(\frac{x^2+12x}{x^2+4x+3}\right)$
$8x^7+3x^7$
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