$3b-10c-5a+7b-2c+4a+c$
$2u^2-u-1=0$
$\int x\left(e^{8x}-5\sqrt[3]{x}+\frac{3}{x^2}-\frac{7}{x}\right)dx$
$3x^2-27<0$
$2.8-1.9$
$\left(cotx-\sqrt{3}\right)\left(2cosx+\sqrt{2}\right)$
$-2x+4>-4$
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