$24-16+20+6-36+10$
$4-49$
$4x-10\cdot4+4x$
$\sqrt{3}+\sqrt{3}-5\sqrt{3}$
$\frac{\csc\left(a\right)+1}{\cot\left(a\right)}=\frac{\cot\left(a\right)}{\csc\left(a\right)-1}$
$x^2+13x+30=0$
$x-\frac{3x+7}{x+4}=\frac{5}{x+4}$
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