$\left(4y^3-z^2\right)\left(4y^3+z^2\right)$
$\lim_{x\to\infty}\frac{3e^x+7}{9lnx+7}$
$9x+3y+9z+7x+2y+5z+6x-7y-3z$
$r^{-5}x\:r^2$
$560-2^2\left(34-24\right)^2$
$36x^2+84x-49$
$2x+5y+7x-y$
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