$4n-2n=-4$
$y^2+6x-1=0$
$\lim_{x\to0}\left(\sqrt{5+x}1-\sqrt{5-x}\right)$
$5t-7t$
$\left(-\frac{3}{5}m^3\right)\left(-5a^2m\right)\left(-\frac{1}{10}a^xm^a\right)$
$16a^2b-54a^3b^4$
$\left(6x^2\:+\:7m^2\right)\left(6x^2\:-\:7m^2\right)$
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