$\int_{-\infty}^1\frac{1}{x^2-4x+8}dx$
$a-5a-35-29$
$3b-3-7b-7$
$\:9x+72$
$-2^3-2\cdot2+4$
$\frac{x-1}{x+3}>x$
$\sqrt{4x}+\sqrt{9x}$
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