$-4w^2\:-\:3w^2$
$20+3.8+6.2+5$
$\int\arcsin axdx$
$\left(+2\right).\left(-7+2\right)$
$-2+\frac{4m}{n}$
$63-\left(-35\right)$
$\frac{1-x^3}{x^2+1}$
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