$30-\left(-12\right)+15-\left(+25\right)$
$\lim_{x\to5}\left(\frac{x^2-25}{\sqrt{x^2+11}}\right)$
$-4157\:+360$
$\frac{8x^2-5x+24}{8x+2}$
$\left(5a^2b^2\right)\left(2ab^3c^3\right)$
$y^2=senx\:in\left(2x+5\right)$
$-\left(12-4x\right)+8\left(10-3x\right)$
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