$4x^2\:+\:\:28x\:+\:49$
$14w^5xy^5z^2-21wxy^3z^5$
$\left(40-50\right)-\left(-10-2\right)\:+2$
$2\cos\left(x\right)+2\sqrt{2}\cos\left(x\right)+1$
$3x^2-1-x^2+3x$
$\left(3a-5x\right).\left(3ab+2\right)$
$\lim_{x\to0}\frac{7x^4-4x^3+8x}{x}$
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