$-123\:-\:+45$
$\left(8a-3\right)^2$
$\int\frac{2x^3-2x^2+1}{x\left(x-1\right)}dx$
$\left(a^2b-c\right)\left(a^2b+2c\right)$
$10mn\left(\frac{3x}{7}-1\right)$
$\lim_{x\to\infty}\left(\frac{5x+8}{5x+3}\right)^{7x}$
$x^2+x-21$
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