$\int3x\left(2x+1\right)^{-5}dx$
$3x-2>x+5$
$\int\:x^4\:\sqrt{s^2-t^2}\:x^2\:dx$
$-4x+\left(-7y\right)$
$\left(7x^3-4y^2\right)^2$
$21+11,2+4,6+4,18$
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