$\log\left(x+5\right)+\log\left(x-2\right)=\log\left(11-x\right)$
$x^2-8x+7=0$
$\lim_{x\to\infty\:}\left(\frac{10-81^{\frac{489}{x}}}{4}\right)^x$
$\left(5\right)^2+\left(7\right)^2\left(9\right)-4$
$y'+xy^2=0$
$3\left(x-2\right)+4\left(2-x\right)$
$x^2+6x+9=\left(x+3\right)$
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