$\sqrt{7+4\sqrt{3}}.\sqrt{7-4\sqrt{3}}$
$-15m^3n+12m^2n$
$5.5-4.75$
$2+\sin^2\left(300\right)$
$\frac{3x^3+2x^2-7+2}{x+2}$
$-3^4-3\left(-3\right)^3+5\left(-3\right)^2-9\left(-3\right)+6$
$b+8>11$
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