$7x\left(-3-4x\right)$
$-55.3\cdot0.5$
$\frac{sin2\left(t\right)+cos2\left(t\right)}{cos2\left(t\right)}$
$6,703-3746$
$\frac{32x^2+10-54}{8x\:-\:9}$
$a^2m-3n-3m+a^2n$
$\lim_{x\to0}\frac{1}{x}-5$
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