$x^2+7x>0$
$x ^ { 2 } y ^ { \prime } = 9 x ^ { 2 } - 6$
$3x^2\left(x-5\right)-2x\left(3x+1\right)+3x\left(x^2+3x-1\right)$
$4\left(x+2\right)<3\left(x-5\right)$
$\left(2x-4y-7z\right)^2$
$8x^3-\frac{z^6}{27}$
$\frac{3}{2}\ge x-2$
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