$y=\left(4x^2+9\right)\left(2x-5+\frac{7}{x}\right)$
$\left(\frac{2}{3}a+2b\right)^3$
$2500x+754y=900$
$\lim_{x\to0}\left(x^3-x^2+2x+1\right)$
$\left(6x-7y^4\right)\left(6x+7y^4\right)$
$\left(4x^3-8\right)^2$
$3x\le2x-5$
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