$-x^2-4x-4y=0$
$\left(3xz^2+5\right)^3$
$62+49-1$
$\lim_{x\to9}-\left(\frac{x\cdot\left(x+18\right)}{\sin\left(\pi x\right)}\right)$
$-7x+3\ge-18$
$\lim_{x\to0}\left(3x-2\right)$
$\left(4x^{x+2}-3x^3\right)\left(4x^{x+2}-8x^3\right)$
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