$2x+3x-11x$
$\int\:\frac{7x^6}{\left(x^7+1\right)^2}dx$
$12x^2-12x$
$x^2+4x+5$
$\left(45+65+78+98+12+32+25\right)-\left(-4-5-6-7-9-1\right)$
$\int\left(3y^4\sqrt{8-3y^5}\right)dx$
$\frac{3x\cdot\:\:tan\left(\frac{\pi}{2}\right)}{sin\left(\frac{\pi\:}{2}\right)}$
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