$3a+5+a+15+2a+10$
$3-2-1-6-5+4+8+7+4-6$
$\sqrt{2}-1.1$
$5^4.5^{-6}$
$x+\frac{2}{x}-1$
$\int\frac{2x^2-5x+4}{x^2\left(x-4\right)}dx$
$\int2\sqrt{a}\sqrt{x}dx$
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