$2+\left(7-3\right)-\left(8-4\right)$
$-9\:-\:\left(-10\right)\:-\:\left(-4\right)$
$\int\frac{10}{\left(x-1\right)\left(x^2-25\right)}dx$
$\frac{\sin\left(a\right)}{1+\cos\left(a\right)}+\frac{\cos\left(a\right)}{\sin\left(a\right)}$
$-50\cdot5$
$-3x+10>11$
$4x+3x=560$
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