$-3\:-\:6x\:<\:-27$
$4a:4a$
$4x^2+12x+3$
$y^2+\frac{dy}{dx}+y^2x=0$
$88\:\cdot4$
$\int\left(\frac{3x^2}{\left(x^4-1\right)}\right)dx$
$\left(1-sin\:x\right)=\left(1+sin\:x\right)$
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