$x^2\:+\:3x^2\:-\:x$
$\int36x\left(9x^2-7\right)^3dx$
$\left(7+\tan\left(x\right)\right)\left(7-\tan\left(x\right)\right)+\sec^2\left(x\right)$
$\int\:\:t^2\:\ln\left(x\right)\:dx$
$-3+\left(+4\right)+\left(+1\right)-\left(-4+1\right)$
$2x+-3>7-x$
$-70-90-10-3$
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