$9x^2-144$
$\left(9x-5\right)^2$
$\left(\frac{7}{2}a^3b^2c-\frac{1}{2}ab^2\right)\left(\frac{7}{2}a^3b^2c+\frac{1}{5}ab^2\right)$
$3x^2+18x=-24$
$\lim_{x\to\infty}\left(1-\frac{1}{x}\right)^{.2x}$
$-9\left[-12+\left(4-3\right)-6\right]-7+3-\left(8-5\right)$
$f\left(x\right)=x\left(x^{2\:\:}\right)$
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