$\left(a^6+\:7\right)\left(a^6\:-\:9\right)$
$\tan\left(0.12860399999999994\right)$
$-\left|-9-6+17\right|$
$x-\frac{3}{4}x+\frac{2}{3}x$
$\left(-10\right)-\left(-250\right)+\left(+15\right)+\left(-59\right)$
$4x^2+11x=15$
$\int\frac{x^5y}{5}\:dy$
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