$-5x.\left(4x^3+3x^4\right)+\left(-14x^7\right):\left(7x^2\right)$
$81m^4-36m^2+4$
$\lim_{x\to\infty}\left(1+\frac{12}{x}\right)^{\frac{x}{2}}$
$-2-3x\ge2$
$5-3+7-1+9-11-34$
$\left(-123\right)+\left(-547\right)-\left(123\right)$
$x+4<3$
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