$x^2-16h^2$
$3xy-4x-9y+12$
$-254-623$
$4d-4+5d-8$
$4x-7=x+11$
$\lim_{x\to\infty}\frac{3}{x}-\frac{3}{x^2}$
$\lim_{x\to0}\left(e^{7x}-8x\right)^{\left(\frac{1}{2x}\right)}$
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