$2y+18=10$
$\frac{2x-6}{x-4}-2x-5$
$\frac{dy}{dt}=-\frac{2}{t}y=t^3-t$
$x^2-1.2x+0.36$
$2-3-11-9$
$tan\left(-t^2+1\right)=-tan\left(t^2-1\right)$
$-\frac{\left(-105m^2n^4+63mn-18\right)}{-3mn}$
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