$5x+18y-13x-14y$
$7x-6=2x+9$
$\int16x\cos\left(8x^2-1\right)dx$
$81x^2-9y^{12}$
$\left(-1\right)^n\left(\frac{n^2}{2n^2}\right)^n$
$\lim_{x\to+\infty}\left(\frac{3x+tan\left(2x\right)}{5x-tan\left(3x\right)}\right)$
$1+-3+-5+7$
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