$3a+4c+ac-7b-7a-15c$
$\int\left(8x^7e^{x^8}\right)dx$
$\lim\:_{x\to\:1}\left(\frac{\left(1+2x\right)}{\left(1-x\right)}\right)$
$\frac{\sec\left(x\right)}{\tan x}$
$6z+36$
$\frac{18x^5+2x^434x^3-46x^2+14x}{-4x}$
$\frac{4x^3-6x^2+2x-9}{3-x}$
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