$-2=-13$
$\left(2x+3\right)\left(4-5x\right)$
$\:\left(-12\right)\left\{45+6\left(-12\right)-\left(-3\left(6\right)+9\right)\left[24-\left(-5\right)\left(-4\right)\right]\right\}$
$\left(x+y-5\right)^2$
$35.462+65.4+85.7$
$\lim_{x\to0}\left(\frac{x^3+1}{x-1}\right)$
$\lim_{x\to-3}\left(\frac{\left(2x+6\right)\left(x+3\right)}{\left(x-2\right)\left(x+3\right)}\right)$
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