$36-568+690$
$\lim_{x\to5}\left(\frac{9x^2-41x-20}{x-5}\right)$
$ax^ay^b+bx^cy^d+\left(c+d\right)x^5$
$4x^2-12$
$\left(10x^3y\right)\left(-6x^3y-\frac{1}{2}yx+6x-8\right)$
$\frac{2}{3}x=\frac{5}{12}x-2$
$5-x>45$
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