$x+4y=12$
$6x+6-5x-10$
$x^2+14x-17$
$\frac{x^2-4x+11}{x-3}$
$\frac{d^2}{dx^2}\left(\:x^2+y^2=4\right)$
$4x^2+5bx$
$-1992-2017$
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