$\lim_{x\to infinity}\left(2\left(-\frac{7}{9}\right)^x\right)$
$\left(-5\right)\left(-6\right)-\left(-50\right)$
$\frac{\left(2x^4-3x^3+8x^2-6x+5\right)}{\left(2x-x+5\right)}$
$-2xy+yx+yx$
$2\left(x+3\right)^2=8$
$\lim_{h\to0}\:h^6sin\left(\frac{1}{h}\right)$
$\frac{5a}{\sqrt{4a-1}}$
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