$-3+\left(4-2\right)+\left(7-\left(4-7\right)+3\right)$
$\lim_{x\to0}\left(\frac{2e^{3x}-2}{x^1}\right)$
$4x^2+1x+49$
$20sin\left(14x\right)sin\left(11x\right)$
$\frac{\:1+\:sinx\left(x\right)}{cos\left(x\right)}=\:sec\:\left(x\right)+\tan\left(x\right)$
$\lim_{x\to3}\left(\frac{\sqrt{x+9}-3}{\sqrt{x+16}-4}\right)$
$7\left(x+1\right)+5=5\left(x-1\right)-7$
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