$12x-3\ge42x+7$
$\left(4-9\right)^2-15^3-137$
$\left(\frac{3}{4}\sqrt{x}-\frac{2}{5}x^{2+a}\right)^3$
$\lim_{x\to-0.01}\left(\frac{2x^2-7x+3}{x}\right)$
$6\:\sin\left(2x\right)\sin\left(5x\right)$
$6x+3y-4x+5-7y$
$x^a\left(1+x^b\right)=x^a+x^b$
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